Question

Major product of the following reaction is

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is B

To determine the major product of the given chemical reaction, we need to consider the reagents and the functional groups involved in the reaction.

The given reactant is a benzene ring with a cyano group (\(\text{CN}\)) and a methoxy carbonyl group (\(\text{CO}_2\text{CH}_3\)). The given reagents are:

• (i) \(\text{CH}_3\text{MgBr} \,(\text{excess})\) - This is a Grignard reagent.
• (ii) \(\text{H}_3\text{O}^+\) - This represents acidic hydrolysis.

Step-by-step Reaction Process:

1. The Grignard reagent, \(\text{CH}_3\text{MgBr}\), will attack the electrophilic center of the carbonyl group (\(\text{CO}_2\text{CH}_3\)), leading to the formation of an alcohol post acidic work-up (hydrolysis).
2. Given that the Grignard reagent is in excess, it will also attack the cyano group (\(\text{CN}\)) twice, resulting in the conversion of the cyano group into a fully substituted tertiary alcohol after hydrolysis.
3. The product obtained after these transformations is a tertiary alcohol with the original benzene ring intact, and additional methyl (CH₃) groups attached due to the Grignard reagent's action.

Conclusion: The major product is a tertiary alcohol derived from both the cyano and ester groups being reacted with excess Grignard reagent and hydrolysis.

Answer 2

The correct answer is (2)