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$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C} \equiv \mathrm{CH} \xrightarrow{R}$ butanone $-2 . R$ is
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$\mathrm{Hg}^{++} /$dil $\cdot \mathrm{H}_2 \mathrm{SO}_4$
Alkyne change to ketone upon hydrolysis in presence of mercury salt.
$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C} \equiv \mathrm{CH} \xrightarrow[\mathrm{Hg}^{2+} / \mathrm{H}_2 \mathrm{SO}_4]{\mathrm{H} . \mathrm{OH}}$
$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C} \equiv \mathrm{CH} \xrightarrow[\mathrm{Hg}^{2+} / \mathrm{H}_2 \mathrm{SO}_4]{\mathrm{H} . \mathrm{OH}}$
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