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Question

Propanoic acid reacts with chlorine (1 eq.) in the presence of small amount of red phosphorus to give

A
Propanoyl chloride
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B
2chloropropanoic acid
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C
Propanal
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D
Propanol
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Solution

The correct option is B 2chloropropanoic acid
Carboxylic acids having an αhydrogen are halogenated at the αposition on treatment with chlorine or bromine in the presence of small amount of red phosphorus to give αhalocarboxylic acids. The reaction is known as Hell-Volhard-Zelinsky reaction.
So, propanoic acid reacts with chlorine (1 eq.) in presence of red phosporous gives 2chloropropanoic acid.



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