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(C) The reaction of an alkyne with $HgSO_4/H_2SO_4$ is a hydration reaction. In this reaction,the triple bond is converted into an enol intermediate,w

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(C) The reaction of an alkyne with $HgSO_4/H_2SO_4$ is a hydration reaction. In this reaction,the triple bond is converted into an enol intermediate,which then undergoes tautomerization to form a stable aldehyde or ketone. For the given substrate,the terminal alkyne group $-C \equiv CH$ attached to the cyclohexanone ring undergoes hydration to form an enol,which tautomerizes to the aldehyde $-CH_2CHO$ group. Thus,the final product $A$ is $2-$($2$-oxocyclohexyl)acetaldehyde.

What is $A$?

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