Question

Compound formed when a mixture of vapours of formic and acetic acid is passed over $MnO$ at ${300}^{o}C$ is:

• A. acetone
• B. acetaldehyde
• C. acetic anhydride
• D. aldol

Answer 1

The correct option is B acetaldehyde

When a mixture of formic acid and acetic acid is passed over heated $MnO$ at ${300}^o$, formic acid reacts with acetic acid to form acetaldehyde, carbon dioxide, and water.

In this reaction, acetic acid is reduced to acetaldehyde and formic acid is oxidized to carbon dioxide.

$HCOOH+C{H}_{3}COOH\underset{MnO}{\overset{300{}^{o}C}{\to }}C{H}_{3}CHO+C{O}_2+H_{2}O$

So, the correct option is $B$