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Question

Reaction of acetylene and propyne with HgSO4 in presence of H2SO4 produces respectively.

A
Acetone and acetaldehyde
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B
Acetaldehyde and acetone
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C
Propanaldehyde and acetone
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D
Acetone and propanaldehyde
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Solution

The correct option is B Acetaldehyde and acetone
Like alkanes and alkenes, alkynes are also immiscible in water and do not react with water. However, one molecule of water adds to an alkyne on warming with HgSO4 and dil. H2SO4 at 333 K to form a carbonyl compound.
Hence, the correct option is (b)

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