Question

Identify A and B in the following reaction.
KMnO4/H+ Cl2,red P4
(a) CH3CHO ------------→ A ------------→ B
NaOH NaOH(CaO)
(b) C6H5COOH---------→ A----------------→ B

Answer 1

Answer:

Correct option is

B

ClCH

2

COOH

CH

3

COOH+Cl

2

RedP

−HCl

A

ClCH

2

COOH

Acetic acid reacts with chlorine in presence of red phosphorous to form monochloro acetic acid. Alpha H atom is replaced with Cl atom. Hence, the compound is ClCH

2

COOH.

HVZ reaction is haogenation of carboxylic acids at alpha carbon atom. In this reaction red-P and chlorine is treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.