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Q.
When chlorine is treated with carboxylic acid in the presence of red phosphorus then chloro acid will be formed, this reaction is known as:
NTA AbhyasNTA Abhyas 2022
Solution:
The reaction of chlorine on carboxylic acids to form alpha chloro acids is called Hell-Volhard-Zelinsky reaction.
$RCH_{2}-COOH\xrightarrow{i . X_2 / \text{red phosphorus } , ii . \text{water} }{ \rightarrow }RCHX-COOH$
In this reaction, alpha hydrogen of carboxylic acids is replaced with halogen atom.