Which one of the following is the intermediat | vedclass

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(D) The hydration of an alkyne in the presence of $H_2SO_4$ and $HgSO_4$ is known as the Kucherov reaction.The reaction proceeds via the electrophilic

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(D) The hydration of an alkyne in the presence of $H_2SO_4$ and $HgSO_4$ is known as the Kucherov reaction.The reaction proceeds via the electrophilic addition of water to the alkyne,catalyzed by the mercury $(II)$ ion,to form an unstable intermediate known as an enol.An enol is a compound containing a hydroxyl group $(-OH)$ attached to a carbon atom that is part of a carbon-carbon double bond $(C=C)$.The enol then undergoes tautomerization to form a more stable ketone.Among the given options,the structure in image $287-$d899 represents an enol intermediate,where the $-OH$ group is directly attached to a $sp^2$ hybridized carbon of the double bond.Therefore,the correct option is $(d)$.

Which one of the following is the intermediate in the preparation of a ketone by hydration of an alkyne in the presence of sulfuric acid and mercury $(II)$ sulphate?

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