Question

Write the preparation reactions for acid amide from the following.

Carboxylic acid

Answer 1

Carboxylic acids react with ammonia to form ammonium carboxylate salt which on further strong heating at high temperature decomposes to give acid amide.

\[\begin{array}{cc}
\phantom{}\ce{O}\phantom{......==.............}\ce{O}\phantom{........................}\ce{O}\phantom{...}\\
\phantom{}||\phantom{.......................}||\phantom{.........................}||\phantom{...}\\
\ce{\underset{\text{Carboxylic acid}}{R - C - OH} + NH3 ⇌ \underset{\text{Ammonium carboxylate}}{R - C - O- - NH^+_4} ->[\Delta][-H2O] \underset{\text{Acid amide}}{R - C - NH2}}
\end{array}\]