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  4. CH 3 CH 2 C ≡ CH xrightarrow R butanone -2 . R is

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Q. $CH _{3} CH _{2} C \equiv CH \xrightarrow{{ R }} $ butanone $-2 . R$ is

JIPMERJIPMER 2005Aldehydes Ketones and Carboxylic Acids

Solution:

Alkyne change to ketone upon hydrolysis in presence of mercury salt.
$CH _{3} CH _{2} C \equiv CH \xrightarrow[{ Hg ^{2+} / H _{2} SO _{4}}]{{ H.OH }}\underset{\text { butanone-2 }}{ CH _{3} CH _{2} COCH _{3}}$