Question

In the $\alpha$ halogenation of aliphatic acids (HVZ reaction), the catalyst used is :

• A. $Zn$
• B. $P$
• C. $FeC{l}_3$
• D. $AlC{l}_3$

Answer 1

The correct option is B $P$

Hydrogen atom of carboxylic acids is acidic in nature. It is labile.
Hydrogen atom of carboxylic acids is replaced by chlorine in the presence of catalyst such as iron, phosphorus or iodine.
This reaction is known as Hell-Volhard-Zelinsky reaction.