Question

Which of the following gives
Hell-Volhard-Zelinsky $(HVZ)$ reaction?

• A. $C{H}_{3}CHO$
• B. $HCHO$
• C. $C{H}_{3}COOH$
• D. $C{H}_{3}COC{H}_3$

Answer 1

Answer: (C)

Carboxylic acids having $\alpha -H$ atom undergo Hell-Volhard-Zelinsky reaction.
$\underset{\text{Acetic acid}}{C{H}_{3}COOH}\underset{-HCl}{\overset{C{l}_2,Redp}{\to }}ClC{H}_{2}COOH$
$\underset{-HCl}{\overset{C{l}_2,Redp}{\to }}C{l}_{2}CHCOOH\underset{-HCl}{\overset{C{l}_2,RedP}{\to }}\underset{\text{Trichloroacetic acid}}{C{l}_{3}CCOOH}$