$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C} \equiv \mathrm{CH} \xrightarrow{R}$ butanone $-2 . R$ is

• Correct answer
  A

  $\mathrm{Hg}^{++} /$dil $\cdot \mathrm{H}_2 \mathrm{SO}_4$
• B

  $\mathrm{KMnO}_4$
• C

  $\mathrm{KClO}_3$
• D

  $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$

Solution

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

Hence, the correct answer is option: 'A'.