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

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

J & K CETJ & K CET 2019Aldehydes Ketones and Carboxylic Acids

Solution:

Carboxylic acids having $\alpha-H$ atom undergo Hell-Volhard-Zelinsky reaction.
$\underset{\text{Acetic acid}}{{CH_{3}COOH}} \xrightarrow[{-HCl}]{{Cl_{2}, Red \,p} }ClCH_{2}COOH$
$\xrightarrow[{-HCl}]{Cl_{2}, Red\,p} Cl_{2}CHCOOH \xrightarrow[{-HCl}]{{Cl_{2}, Red\, P} } \underset{\text{Trichloroacetic acid}}{{Cl_{3}CCOOH}}$