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The given reaction illustrates the Hell-Volhard-Zelinsky reaction, where carboxylic acids containing an α-hydrogen react with X2 in the presence of phosphorus to produce dihalogenated acids. Which of the following represents this reaction?

1. CH3-CH2COOH → Br/P → CH3-CBr2-COOH
2. CH3-CH2COOH → Cl/P → CH3-CCl2-COOH
3. CH3-CH2COOH → I/P → CH3-CI2-COOH
4. CH3-CH2COOH → F/P → CH3-CF2-COOH

Correct answer: CH3-CH2COOH → Br/P → CH3-CBr2-COOH

Solution

The Hell-Volhard-Zelinsky reaction involves the halogenation of carboxylic acids containing α-hydrogens using X2 (halogen) in the presence of phosphorus. Bromine (Br2) is commonly used, making option A correct.

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