Question

Fig.

 

 

 

In the above reaction ‘A’ is

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is C

To determine the identity of compound 'A', we need to analyze the reaction sequence provided.

Fig. Reaction Sequence

The reaction describes the conversion of compound 'A' into 4-Bromophenyl acetic acid through the following steps:

1. Halogenation with Cl_2 at elevated temperature.
2. Substitution with CN^− (cyanide ion).
3. Hydrolysis with water in the presence of H^+ ions.

Given these reactions, the sequence of transformations suggests that 'A' is likely benzyl chloride. Here's why:

1. Halogenation: Chlorination of toluene (methylbenzene) can occur at the benzylic position to form benzyl chloride under heat.
2. Nucleophilic Substitution: Benzyl chloride can undergo nucleophilic substitution with cyanide ion to form benzyl cyanide (phenylacetonitrile).
3. Hydrolysis: Benzyl cyanide can be hydrolyzed to form phenylacetic acid, a known precursor to 4-bromophenyl acetic acid after bromination.

Therefore, the correct identity of 'A' that matches with all transformations provided is benzyl chloride. This is consistent with the correct answer:

Benzyl Chloride

The option correctly identifies benzyl chloride as compound 'A' in the given reaction.