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Q.

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

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a

$C_{2} H_{2}$

b

$C_{2} H_{4}$

c

${CH}_{4}$

d

$C_{6} H_{6}$

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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