Q.
The product formed during Hell-Volhard-Zelinsky reaction is
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Aldehydes Ketones and Carboxylic Acids
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Solution:
Carboxylic acids having an α-hydrogen are halogenated at the α-position on treatment with chlorine or bromine in the presence of small amount of red phosphorus to give α-halocarboxylic acids. The reaction is known as Hell-Volhard-Zelinsky reaction.