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Q.

Which of the following decolourises Bayer’s reagent and also can react with Na/LiqNH3

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a

2-butyne

b

Ethene

c

Benzene

d

1-pentyne

answer is D.

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Detailed Solution

due to unsaturation it decolourises Baeyer's reagent  , due to acidic hydrogen it reacts with sodium and liquid ammonia, it forms sodium salt of 1- pentyne

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