Question
Write the reactions involved in the following :
- Hell $-$ Volhard Zelinsky reaction
- Decarboxylation reaction
✓
Answer
- Hell $-$ Volhard Zelinsky reaction: Carboxylic acid having $\alpha -$ hydrogen are halogenated at $\alpha -$ position on treatment with chlorine or bromine in the presence of red phosphorous to give $\alpha -$ halogenated carboxylic acid.
- Decarboxylation reaction: Carboxylic acid lose $\ce{CO_2}$ to form hydrocarbons when their sodium salts are heated with sodalime $\ce{(NaOH}$ and $\ce{CaO}$ in the ratio $3:1)$. The reaction is known as decarboxylation reaction.
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