Question

The product formed during Hell-Volhard-Zelinsky reaction is
A. `underset(X) underset(|)(R-CH-)COOH`
B. `R-CH_(2)-COX`
C. `underset(X) underset(|)(R-C-)COOH`
D. `underset(X) underset(|)(R-CH-)CH_(2)-COOH`

Answer 1

Correct Answer - A
Carboxylic acids having an `alpha-` hydrogen are halogenated at the `alpha`- position on treatement with chlorine or bromine in the presence of small amunt of red phosphorus to give `alpha`-halocarboxylic acids. The reaction is know as Hell- Volhard-Zelinsky reaction.