Does ketone decolourise bromine water. Therefore, it is an aldehyde or a ketone.

Any compound which decolourises bromine is an unsaturated compound. aldehyde or ketone. The attached atoms are in a high oxidation state, and their reduction converts these electron withdrawing functions into electron donating amino and alkyl groups. Alkenes can decolourise bromine water, while alkanes cannot. Hence, no decolourisation of bromine water by Bromine water is an orange solution of bromine. identify the compounds (a) and (b) and explain the reactions involved. C. Apr 28, 2016 · 1 Answer. Bromine water is an orange coloured solution; When bromine water is shaken with an alkane the solution remains orange; When bromine water is shaken with an alkene, the solution will go colourless, as the bromine can add across the double bond meaning it is no longer in solution; How to distinguish between alkanes and alkenes Alkenes will May 27, 2019 · Bromine water is an orange solution of bromine. Thus only C 2 H 4 will gove bromine water test but not silver mirror test. Which of the following does not decolourise bromine water? View Solution. • C2H6 is a saturated hydrocarbon with no unsaturation and therefore it does not decolourize bromine water or give a precipitate with ammonical AgNO3. Alkenes and alkynes react with bromine water in the dark condition and undergo an addition reaction, to give a decolourized solution. An organic compound A with molecular formula C8H8O forms an orange red precipitate with 2,4−DNP reagent and gives yellow precipitate on heating with iodine in the presence of sodium hydroxide. Aug 14, 2020 · (a) On adding bromine water, the unsaturated hydrocarbon decolourises the bromine water but the saturated hydrocarbon will not decolourise bromine water. It neither reduces Tollens' or Fehling's reagent, nor does it decolourise bromine water or Baeyer's reagent. Roberts and Marjorie C. B. 122 terms. If you shake an alkene with bromine water (or bubble a gaseous alkene through bromine water), the solution becomes colourless. Deduce It neither reduces Tollens' or Fehling's reagent, nor does it decolourise bromine water or Baeyer's reagent. It can only share four electrons. The other three isomers are: Mar 14, 2018 · Hence, salicylic acid will react with bromine water, but benzoic acid won't. Q 3. Explore the interactive simulation of the bromination of acetone, a chemical reaction that involves free radicals and chain propagation. Therefore, it is an aldehyde or a ketone. Aromatic compounds like benzoic acid does not give these unsaturation test and they does not disturbs there aromaticity. That's why kerosene is unable to decolourise the bromine water. On excessive oxidation with chromic acid, it gives a carboxylic acid (B) having molecular formula C 7 H 6 O 2. This is exactly like the reaction which happens with phenol. When few drops of bromine (which is brown in colour) are added to ethylene, bromine is used up by the double bond of ethylene and brown colour of bromine disappears. A hydrocarbon 'X' on reaction with B r 2 in presence of C C l 4 decolourises bromine water. It is used to identify the alkene or alkane functional groups present in the compound. g. Cyclo propane ring is very unstable, behaves like an alkene and May 30, 2022 · Which hydrocarbons can Decolourise bromine water? C6H12 (Hexene) and C6H10 (Hexyne or Cyclohexene ) are the hydrocarbons which can decolourize bromine water, as they are unsaturated. Determine the compounds (A) and (B), and explain the reactions involved. Jul 11, 2024 · Complete step-by-step answer: As we know Hydrocarbon compound decolorizes bromine water it is unsaturated hydrocarbon as well as hydrocarbon is an alkane because bromide and it undergoes an addition reaction along with unsaturated compound with containing double or a triple bond became and which in results become too much unstable. The reaction between bromine and alkenes is an example of a type of reaction called an addition reaction. 'A' on refluxing with dil. 3: Halogenation of Aldehydes and Ketones is shared under a CC BY-NC-SA 4. 3) Although ketones tend to not form gem -diols this compound exists almost entirely in the gem -diol form when placed in water. Mar 5, 2020 · Therefore, it is an aldehyde or a ketone. So B would be the false statement. Bromine water engages in a reaction mechanism with unsaturated compounds (i. Kerosene, coconut oil, mustard oil do under normal conditions, it does not: • Decolourise bromine water • React with strong acids such as HCl • React with the 3 halogens, Cl,Br or I In addition reactions, the electron from the delocalised system would need to bond to the atom or groups of atoms being added. The molecular formula shows that there should be unsaturation in the compound but ‘A’ does not decolourise bromine water or Bayer’s reagent which shows that the presence of unsaturation is due to benzene ring. The chemistry of the test. It neither reduces Tollens' or Fehling's reagent, nor does it decolourise bromine water or Baeyer's reagent. Bromine water decolourisation is an unsaturation test which is given by the compounds having double or triple bonds (unsaturation). On drastic oxidation of (A) with chromic acid, a carboxylic acid (E) of molecular formula C7H6O2 is formed. View Solution. Study with Quizlet and memorize flashcards containing terms like Compounds A, B and C all have the molecular formula C5H10 A and B decolourise bromine water but C does not. The bromine reagent is in reddish color, and the product vicinal dibromide is colorless. 'A' on treatment with HBr/ROOR forms CsH10Br2 which on further treatment with NaOH(aq) gives the cyclic ether The starting compound 'A' most likely to be. How does alkane react with bromine water? Since alkane is a saturated compound, it does not react with a bromine water solution. (The 6- position is, of course, just the Jan 1, 2020 · However, in option (d), the nitrile also reacts with Grignard to give an imine and eventually a ketone and the ring (which isn't benzene) has double bonds but I'm not sure if those double bonds can decolorize bromine water. Ethene is a unsaturated carbon compound and ethane is a saturated carbon compound. If an aqueous solution of bromine is used ("bromine water"), you get a mixture of products. A hydocarbon (Z) has molecular formula C8H10. Therefore Jan 23, 2023 · If bromine water is added to phenylamine, the bromine water is decolourized and a white precipitate is formed. On drastic oxidation with chromic acid, it gives a carboxylic acid (B) having molecular Do aldehydes and ketones decolourises bromine water? - 8126952. Which of the following will not decolourise bromine water : View Solution. 81 and a density of 1. However, carboxylic acids, can be brominated in the alpha position with a mixture of Br 2 and PBr 3 in a reaction called the Hell-Volhard-Zelinskii reaction. An organic compound (A) with molecular formula, C 8 H 8 O forms an orange-red precipitate with 2,4-DNP reagent and gives yellow precipitate on heating with iodine in the presence of sodium hydroxide. Aldehydes are oxidized by Tollen’s reagent to give black silver mirror. An aldehyde (or a ketone) reacts with 2,4-DNP to form a 2,4-dinitrophenyl hydrazone derivative. So it will decolourise Bromine water and also fizz when added to Carbonate solutions. e PhCOCH3. the C=O bond is nt broken at all. The structure of butyne is HC ≡ C-CH 2-CH 3. Was this answer helpful? ketone. It also does not decolourise bromine water as double bond of phenyl ring is involved in reaction with bromine water. go to colourless!). The structure of 'X' is: Dec 30, 2023 · Br2/H2O or Bromine water, also called Bromide bromate solution. Kerosene does not decolorize bromine water while cooking oils do because kerosene is a mixture of alkanes (saturated compound). Assertion :Phenol forms 2,4,6-tribromophenol on treatment with Br2 in carbon disulphide at 273K. Alkene groups react with bromine water in the dark condition and undergo an addition reaction, to give a decolourized solution. 307 g/mL. on drastic oxidation with chromic acid ,it gives a carboxylic acid (b) having molecular formula C7H6O2. Therefore when ethene is in contact with bromine water it goes under addition reaction whereas ethane does not. Therefore, this reaction is used for the detection of unsaturation in an organic molecule. Name the products formed on oxidation of 2, 5-dimethylhexan-3-one. Bromine water is an orange solution of bromine. By electrophilic addition to give the halohydrin, RC(OH)H − CH 2Br. It neither reduces tollens' or fehlings' reagent, nor does it decolourise bromine water or Baeyer's reagent. Benzene has no double bonds, however benzene has a ring of delocalised electrons for that reason benzene is less reactive. The slideshow shows this process Feb 21, 2019 · Why does F not decolourise bromine water? (1) F does not contain a double bond. On drastic oxidation with chromic acid, it gives a carboxylic acid (B) having molecular Thus, Benzene does not decolorize Bromine water. e things with carbon-carbon double bonds, triple, etc), to decolourise the water, and you should know alkenes are unsaturated compounds. Thus bromine Reduction of Nitro Groups and Aryl Ketones Electrophilic nitration and Friedel-Crafts acylation reactions introduce deactivating, meta-directing substituents on an aromatic ring. In the case of the reaction with ethene, 1,2-dibromoethane is formed. It is also helpful in testing the bunch of Aldehyde present in any compound. When bromine is added to the sample, if the reddish color disappear, that means the sample does contain an alkene. H_2SO_{4 }. Reason: Unsaturated hydrocarbon undergoes substitution reaction with bromine water. Dil. There is one triple bond and this undergoes this bromine water test . bromine is a halogen and saturated compounds undergo sustitution reaction with halogens,then why does saturated compounds do not decolourise bromine water as bromine will substitute hydrogen in this case also? Assertion :Unsaturated hydrocarbons decolorize the red coloured bromine water. Deduce the structures of the organic compounds (A) to (E) . The nly bond affcted by bromine water is C=C because one of the bonds in there s pretty wek in comparison to the The reaction between C=C double bond and bromine (Br 2) can be used as a test for the presence of alkene in an unknown sample. Use this information to deduce a possible structure for each of compounds A, B and C and explain your deductions. The precipitate is 2,4,6-tribromophenol. (f) One of the compounds in the table reacts with bromine to form G, a compound with the composition by mass C = 22. × Step 2 - Positive iodoform test suggests -CO-CH3 group. Hence this compound A is nothing but a ketone. Halogenation of saturated aldehydes and ketones usually occurs exclusively by replacement of hydrogens alpha to the carbonyl group. Oct 11, 2019 · Give reasons for the following: (i) Element carbon forms compounds mainly by covalent not decolourise bromine water while cooking oils do. On ozonolysis it gives 3-methyl butanal and formaldehyde, give the name of the compound. Wiki User. As it is a ketone, it can not reduce tollen's reagent to give silver mirror. It is often used as a reactive in chemical assays of recognition for substances which react with bromine in an aqueous environment with the halogenation mechanism, mainly unsaturated carbon compounds (carbon compounds with 1 or Click here👆to get an answer to your question ️ An organic compound (A) with molecular formula, C8H8O forms an orange - red precipitate with 2,4 - DNP reagent and gives yellow precipitate on heating with iodine in the presence of sodium hydroxide. 7. So oils give addition reaction with bromine water and decolorize it. Alkenes decolourise bromine water. Feb 25, 2016 · Answer. C 2 H 5 OH + 3O 2 → 2CO 2 + 3H 2 O + heat + light (ii) Two forms of energy obtained are heat energy and light energy. Ethene, butyne, and hexyne can decolourize bromine water. 2019 Chemistry Secondary School answered It neither reduces Tollen`s or Fehlings` reagent , nor does it decolourise bromine water or baeyer`s reagent . The bromine loses its original red-brown color to give a colorless liquid. Explanation: Aldehydes and ketones are organic compounds that contain a carbonyl group , which is a carbon-oxygen double bond. Jul 31, 2021 · This page titled 17. ). Which compound does not give bromine water test? Answer: Since alkane is a saturated compound, it does not react with a bromine water solution. It decolourizes bromine water and also forms a white precipitate with ammonical AgNO3 indicating the presence of a terminal alkyne. RCH = CH 2 +Br2 → RCH Br −CH 2Br. Reason for Alkene Decolorize Bromine Water: When Br 2 /CCl 4 is added to the alkene, the reddish-brown colour of bromine is discharged due to the formation of colourless vic dibromide. May 12, 2014 · In my exam, I was asked why cyclopropane could decolourise bromine water (indicating that it reacted with the bromine). Write the structure of A, B and C. × Step 4 - A doesn't decolourize bromine water, therefore unsaturation is Use the fact it doesn't decolourise bromine water to eliminate the option of it being an alkene. (A) does not reduce Tollens reagent of Fehling's solution nor does it decolourise bromine water. . (iii) A hydrocarbon (Z) has molecular formula C3H10. Jun 3, 2024 · Benzene will not decolourise bromine water as it does not undergo addition reaction. Unsaturated compounds undergo addition reaction, while alkanes do not. However, cycloalkanes do not decolourise bromine water because it consists of single carbon- carbon bonds which means that the molecule is saturated and it will show no reaction when cycloalkanes reacts with bromine water. Do all unsaturated compounds Decolourise bromine water? Aqueous bromine can only decolourise C=C double bonds in alkenes (with no ppt. Verified by Toppr. (2) Therefore, it should be a methyl ketone. ∙ 11y ago. In presence of Lewis acid Bromine molecule (Br 2) get polarised and protonated to form Br + which acts as an Electrophile. Therefore, it should be a methyl ketone. Notice the multiple substitution around the ring - into all the activated positions. Physically, bromine water is orange due to $\ce{Br2}$, but if the bromine reacts, then the orange color will no longer be present. If bromine water is added to a solution of phenol in water, the bromine water is decolorized and a white precipitate is formed which smells of antiseptic. Mar 28, 2022 · It is both an Alkene and a Carboxylic acid. While oils are unsaturated compounds. decolourisation of bromine water is the test of an alkene. Explaination-We'll try to deduce the compound step-by-step, × Step 1 - Molecular formula (C8H8O) and +ve DNP-test indicates aldehyde or ketone. A. Since it does not decolourise bromine water, it is arene, its formula is. Which of the following compounds gives a positive Tollen's test but negative Fehling's test? Feb 23, 2022 · Benzoic acid cannot decolourise Bromine water. (i) Show, by calculation, that the empirical formula of G is C 2 H 4 Br (3) (ii) The relative formula mass of G is 216 Deduce the molecular formula of G. The formula of C 4 H 6 is Butyne. Solution. This has the effect of ‘saturating’ the molecule, and will turn an alkene into an alkane. Here, 2,4-DNP reagent means 2,4-dinitrophenyl hydrazine. It also does not decolourise bromine water as Jan 23, 2023 · Example 1: Reaction with Bromine Water. It does not decolourise bromine water and is oxidised to benzoic acid on heating with K2Cr2O7 . , Compounds A, B and C all have the molecular formula C5H10. Quick lime. (v) Kerosene does not decolourise bromine water while cooking oils do. Preview. On drastic oxidation with chromic Jun 2, 2017 · Study with Quizlet and memorize flashcards containing terms like Explain why an increase in temperature increases the rate at which this gas decomposes. The bromine water test is a confirmatory test for unsaturation. Using bromine water as a test for alkenes. 0 license and was authored, remixed, and/or curated by John D. H 2 SO 4 produces B ( C 9 H 10 O 3 ) which forms salt with NaOH and on treatment with CH 3 COC ℓ yields C 13 H 14 O 5 . Since it does not reduce Tollens’ or Fehling reagent, (A) must be a ketone. When ethene is in contact with bromine water it goes under addition reaction whereas ethane does not. On drastic oxidation with chromic acid, it gives a carboxylic acid (B) having molecular May 23, 2019 · Answer: Explanation: Compound A with molecular formula C8H8O give positive DNP and iodoform test it neither reduce tollens reagent nor does it decolourise bromine water white. ) and phenols (with white ppt. Ketones do not react with Tollen’s reagent. Was this answer helpful? Bromine water helps in testing and detecting unsaturated hydrocarbons such as alkene and alkynes. Jan 24, 2018 · An organic compound (A) with molecular formula C8H8O forms an orange-red precipitate with 2,4-DNP reagent and gives yellow precipitate on heating with iodine in the presence of sodium hydroxide. Which alkyl groups decolourises bromine water and does not give white precipitate with A Bromine water, commonly known as bromide bromate solution, is a chemical compound having the formula Br2. 7%, Br = 74. • Fluorine is more electronegative than bromine and would remove more electron density from the carbonyl carbon. 11. Caserio. On the other hand, Cooking oil or the edible oils are completely made out of unsaturated fat molecules, that's why they easily decolourise the normal bromine water. The decoloration of bromine is often used as a test for C-C double and triple bond. When bromine water is added to an unsaturated compound, the former gets added to Confused! unsaturated compounds decolourise bromine. Also 'X' reacts with K M n O 4 in the presence of an acid to give two moles of the same carboxylic acid. The bromine water in carbon tetrachloride is a reddish-brown colour that when added to an unsaturated compound becomes colourless. This is a demo project from the Center for Interactive Learning in Chemistry at the University of Oregon. Phenols also undergo electrophilic substitution reactions when reacted with bromine water at room temperature ; Phenol decolourises the orange bromine solution to form a white precipitate of 2,4,6-tribromophenol; This is also known as the bromination of phenol C6H10. The molecular formula of (A) indicates high degree of unsaturation, yet it does not decolourise bromine water or Baeyer’s 5. When we react Bromine water with Alkenes, Bromine water gets decolorized and when it is reacted with saturated hydrocarbons it does not get decolorized. Learn how different factors affect the rate and mechanism of the reaction, and test your understanding with quizzes and exercises. Alkenes can decolourise bromine water, but alkanes cannot. The precipitate is 2,4,6-tribromophenylamine. Q2. e. The original solution contains(a) a secondary alcohol (b) an alkene(c) an ether(d)a primary alcohol Jan 23, 2023 · The bromine loses its original red-brown color to give a colorless liquid. Due to delocalisation of pi electrons benzene doesnt give test of unsaturation and doesnt undergo addition reaction. (As aromatic system is most stable) Ethene is an unsaturated carbon compound and ethane is a saturated carbon compound. Q 4. 1%. All of the above. A compound is soluble in conc. Nov 23, 2023 · This is because only aldehydes and ketones enolize to a sufficient extent to allow the reaction to occur. It becomes colourless when it is shaken with an alkene. $\endgroup$ – Aug 12, 2023 · Yes, aldehydes and ketones decolourise bromine water due to the reaction between the carbonyl group in the aldehyde or ketone and the bromine molecule. No thats not possible, bromine water can only decolourise alkenes not carboxylic acids. State the meaning of the term Explain why, ethane decolourises bromine water whereas ethane does not. unsaturated compounds decolourise bromine water as bromine is added to them. Was this answer helpful? Why does F not decolourise bromine water? (1). It is highly saturated due to presence electron cloud above and below it. Compound (B), being an oxidation product of a ketone should be a carboxylic acid. Does benzene undergo bromine water test? No. (A) forms 2,4-DNP derivative. The molecular formula of (A) indicates high degree of unsaturation, yet it does not decolourise bromine water or Baeyer’s reagent. This would destabilize the carbonyl allowing for more gem -diol to form. However, if the reaction occurs in presence of Lewis acid Ferric chloride (FeBr 3) and Aluminium chloride ( AlCl 3) then, the bromination of Benzene will take place. 327. This 5. But (of course) there is an added sting in the tail of Dec 28, 2018 · Hey dear, Answer- Acetophenone (C6H5-CO-CH3). Nairaj7434 Nairaj7434 11. × Step 3 - A doesn't reduce Tollens reagent which makes it a ketone. Jul 7, 2022 · Does Cyclobutane Decolourise bromine water? It converts a yellow solution into a colourless solution. Answer: (i) It is because carbon has four valence electrons, it cannot gain or lose four electrons because high energy is needed. It does not decolourise bromine in CCl_4 but is oxidised by chromic anhydride in aqueous sulphuric aid within two seconds, turning orange solution to blue green then opaque. yet it does not decolourise bromine water or Baeyer’s reagent. ammoniacal silver nitrate is used to test the presence of carbonyl compound i. Solution: The bromine water test is a qualitative test, used to identify the alkene, alkyne or alkane functional groups present in the compound. The other three isomers are: 260 Views. Use this information to deduce a possible structure for each of It neither reduces Tollens' or Fehling's reagent, nor does it decolourise bromine water or Baeyer's reagent. (ii) A hydrogen (Y) decolouries bromine water. The structure of A is benzophenone i. The original solution contains(a) a secondary alcohol (b) an alkene(c) an ether(d)a primary alcohol An organic compound (A) with molecular formula, C 8 H 8 O forms an orange-red precipitate with 2,4-DNP reagent and gives yellow precipitate on heating with iodine in the presence of sodium hydroxide. (A) responds to iodoform test. (ii) It is due to strong covalent bonds and compact structure of diamond. Bromine water. Thus, the solution will turn colorless upon contact with salicylic acid, and will stay orange in contact with benzoic acid. Bromine water is just a yellow mixed solution with a strong oxidation ability due to the combination of diatomic bromine (Br2) and water (H2O). H 2 S O 4. Aldehyde and ketone are colourless and stable compound. Olefins are electron rich species and react with electrophiles or potential electrophiles: i. However, saturated hydrocarbons, e. Bromine undergo addition reactions with unsaturated compounds like alkenes and alkynes containing a double or a triple bond. Oxidation of ketones involves carbon-carbon bond cleavage. On drastic oxidation with chromic acid, it gives a carboxylic acid B having molecular unsaturated compounds decolourise bromine water as bromine is added to them. This decoloration of bromine is often used as a test for a carbon-carbon double bond. Study with Quizlet and memorize flashcards containing terms like Why doesn't benzene readily undergo addition reactions like alkenes?, Does benzene decolourise bromine water under normal conditions?, Why would this reaction not be energetically favourable? and more. Pijapiii. On drastic oxidation with chromic acid, it gives a carboxylic acid (B) having molecular formula C 7 H 6 O 2. Even though benzene has an unsaturated double bond, they have stable delocalized pi bonds, and it does not react with a bromine water solution. Br 2 (aq) is an orange-yellow solution, called bromine water; The unknown compound is shaken with the bromine water; If the compound is unsaturated, an addition reaction will take place and the coloured solution will decolourise; The bromine water test is the standard test for unsaturation in alkenes May 4, 2023 · An organic compound ' A ' (C 9 H 8 O 2 ) does not decolorizes bromine water and evolves no gas with CH 3 MgBr, but gives orange precipitate with 2, 4 - dinitro phenyl hydrazine. Alkane doesn’t react with bromine water and the colour of the Compound (A) gives a yellow precipitate (C) When heated in the presence of iodine and NaOH alongwith a colourless compound (D). Comprehension #2 An organic compound 'A' has molecular formula C5H9Br decolorises brown colour of bromine water but does not rotate plane polarised light. On drastic oxidation of (A) with chromic acid, a carboxylic acid (E) of molecular formula C 7 H 6 O 2 is formed. As there is a reaction between ethene and bromine water ethene decolorizes bromine water. The bromine is decolourised because a colourless dibromo compound forms. Jul 17, 2018 · As it is a ketone, it can not reduce tollen's reagent to give silver mirror. Suggest Corrections. It does not decolouries bromine water and is oxidised to benzoic acid on heating with K Using bromine water as a test for alkenes. 02. C 6 H 12 (Hexene) and C 6 H 10 (Hexyne or Cyclohexene ) are the hydrocarbons which can decolourize bromine water, as they are unsaturated. It can also have the three other isomers A, B and C. Bromine water has a molecular mass of 159. , ethane do not add up bromine and so colour of bromine is not decolourised. Alkenes and bromine water. Bromine water is an oxidizing, intense brown mixture containing diatomic bromine (Br 2) dissolved in water (H 2 O). (A) does not reduce Tollens' reagent or Fehling solution nor does it decolourise bromine water. D. B exists as two stereoisomers but A does not show stereoisomerism. why does phenol decolourise bromine water? the lone pair of electrons on the oxygen atom increases the electron density by interacting with the delocalised Mar 13, 2012 · Ishan Goyal, added an answer, on 13/3/12. bromine is a halogen and saturated compounds undergo sustitution reaction with halogens,then why does saturated compounds do not decolourise bromine water as bromine will substitute hydrogen in this case also? View Solution. Dec 23, 2011 · Since ‘A’ does not reduce Tollen’s or Fehling’s reagent, it must be a ketone. Reason: Bromine polarises in carbon disulphide. Benzene follows it's own set of rules. Bromine water will only decolourise if there is a double bond for the bromine to add across. 2%, H = 3. 1. Kerosene doesnot not decolourise bromine water while cooking oil does cuz cooking oil are unsaturated while kerosene This decolourising of bromine water is a test for unsaturated compounds. Identify the compounds (A) and (B) and explain the reactions involved. 5∘ 109. The brown colour of the bromine would dissipate (i. All I could guess was that it is related to the high angle strain in cyclopropane, as the C–C–C bond angle is 60∘ 60 ∘ instead of the required 109. The mechanism of this reaction involves an acid bromide enol instead of the It reacts neither with sodamide nor with ammonical cupprous chloride. This indicates the presence of unsaturation due to an aromatic ring. It is technically an unsaturated hydrocarbon, but it is very unreactive due to it's structure. This compound doesn’t reduce Tollens’ or Fehlings’ reagent, and it does not decolourise bromine water or Baeyer’s reagent. Aldehyde and ketones can decolourise . 5 ∘. A and B decolourise bromine water but C does not. 2. Tollen’s reagent is an ammoniacal silver nitrate solution. (b) (i) Ethanol burns in air to produce carbon dioxide and water. This is complicated by the fact that the major product isn't 1,2-dibromoethane. It becomes colourless when shaken with an alkene. No book I have read mentions this reaction. nc qw ot oh lg yy lf xt do qb