Question:
Which of the following reactions involves \(\alpha-halogenation\) of carboxylic acid?
Which of the following reactions involves \(\alpha-halogenation\) of carboxylic acid?
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HVZ reaction is a key method to halogenate the \(\alpha\)-carbon of carboxylic acids using red phosphorus and halogens.
Updated On: Feb 18, 2026
- Gattermann reaction
- Riemer–Tiemann reaction
- Sandmeyer reaction
- Hell–Volhard–Zelinsky reaction
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The Correct Option is D
Solution and Explanation
Step 1: Recall the HVZ reaction.
The Hell–Volhard–Zelinsky reaction specifically introduces a halogen atom at the \(\alpha\)-carbon of a carboxylic acid.
Step 2: Analyze other reactions.
Gattermann and Sandmeyer reactions involve aromatic diazonium salts, while Riemer–Tiemann reaction introduces a formyl group in phenols.
Step 3: Conclusion.
Therefore, the reaction involving \(\alpha\)-halogenation of carboxylic acids is the Hell–Volhard–Zelinsky reaction.
The Hell–Volhard–Zelinsky reaction specifically introduces a halogen atom at the \(\alpha\)-carbon of a carboxylic acid.
Step 2: Analyze other reactions.
Gattermann and Sandmeyer reactions involve aromatic diazonium salts, while Riemer–Tiemann reaction introduces a formyl group in phenols.
Step 3: Conclusion.
Therefore, the reaction involving \(\alpha\)-halogenation of carboxylic acids is the Hell–Volhard–Zelinsky reaction.
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