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Identify X in the following reaction.

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in Chemistry – Class 12 by (188k points)
Identify X in the following reaction.

(a) i) Br2-red P; ii) H2O

(b) i) Cl2-red P; ii) H2O

(c) PBr3-H2O

(d) PBr5-H2O

The question was asked in an online quiz.

This intriguing question comes from Carboxylic Acids Chemical Reactions topic in chapter Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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Right answer is (a) i) Br2-red P; ii) H2O

To elaborate: Propanoic acid undergoes bromination at alpha-carbon in the presence of red phosphorus to give α-Bromopropanoic acid. This is known as Hell-Volhard-Zelinsky reaction.

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