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Question
Write chemical equations to illustrate the following named reaction:
Hell-Volhard-Zelinsky reaction
Short Note
Solution
Carboxylic acids react with chlorine or bromine in the presence of (red) phosphorus to give compounds in which the α-hydrogen atom is replaced by a halogen atom.
\[\ce{\underset{Acetic Acid}{CH3COOH} + Cl2 ->[Red P][H2O] \underset{Chloroacetic acid}{ClCH2 - COOH} + HCl}\]
\[\ce{ClCH2COOH + Cl2 ->[Red P][H2O] \underset{Dichloroacetic acid}{Cl2CHCOOH + HCl}}\]
\[\ce{Cl2CHCOOH + Cl2 ->[Red P][H2O] \underset{Trichloroacetic acid}{Cl3CCOOH + HCl}}\]
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Aldehydes and Ketones - Reduction to Alcohol and Alkanes
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