Question:

Write the chemical equation for Hell-Volhard-Zelinsky reaction.

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HVZ reaction works only on carboxylic acids having alpha-hydrogens.
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Solution and Explanation

Step 1: The Hell-Volhard-Zelinsky (HVZ) reaction is used for alpha-halogenation of carboxylic acids.
Step 2: In the presence of red phosphorus and halogen, the alpha hydrogen of a carboxylic acid is replaced by a halogen.
Step 3: Example: \[ CH_3COOH + Br_2 \xrightarrow{P} CH_2BrCOOH + HBr \]
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