Question

What is product $'B'$ in the given sequence of reaction, $CH\equiv CH\overset{H g S O_{4} / H_{2} S O_{4}}{ \rightarrow }A\overset{N a O H}{ \rightarrow }B$

• A. $CH_{3}COONa$
• B. $CH_{3}COOH$
• C. $CH_{3}CHO$
• D. $CH_{3}CH\left(\right.OH\left.\right)CH_{2}CHO$

Answer 1

Answer: (D)

Formation of $A$ is the hydration of alkyne i.e. Kucherov’s reaction which produces $CH_{3}CHO$ ,
acetaldehyde. This undergoes aldol condensation in the presence of NaOH to give beta hydroxy
aldehyde