Question

In the following reaction, $H_{3}C-C\equiv \equiv C-H\underset{H_3{O}^{+}}{\overset{H{g}^{2+}}{\to }}X\underset{phCHO}{\overset{dil.NaOH}{\to }}Y$ $X$ and $Y$, respectively, are

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

In first step one molecule of water adds to alkyne on warming with mercuric sulphate and dilute sulphuric acid to form carbonyl compound, i.e. acetone. In second step $2$ molecules of acetone condense in presence of dil. $NaOH$ to form $\alpha$, $\beta$-unsaturated ketone. This reaction is known as aldol condensation