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Question

In the following reaction order, B is
CH3CH2COOHRed P−−Br2AAlc.KOH−−−−−H+B

A
CH2=CHCOOH
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B
CH3CH2COBr
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C
CH3CH(Br)COOH
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D
CH3CH2OH
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Solution

The correct option is A CH2=CHCOOH
Reaction1 : Hell-Volhard-Zelinsky reaction involves the replacement of an α-hydrogen atom from from the alkyl group of a monocarboxylic acid by a halogen atom.
Reaction2 : Dehydrohalogenation reaction.
CH3CH2COOHRed P−−Br2CH3CH(Br)COOHAlc.KOH−−−−−H+CH2=CHCOOH

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