Q.

The compound which decolourises bromine water but does not give white precipitate with Tollen's reagent.

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a

C2H2

b

C2H4

c

CH4

d

C6H6

answer is B.

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Detailed Solution

  • Ethene is an unsaturated compound which decolourises the bromine water and it does not give white precipitate with Tollen’s reagent. 
  • Decolourisation of bromine water is the test which is used for an alkene. Ammoniacal silver nitrate is used to test the presence of carbonyl compound like aldehyde or ketone. 
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