Question

The major product obtained in the following reaction is
 

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is A

To determine the major product of the given reaction, let's analyze the reaction conditions and the structural components of the reactant.

The reactant is a dicarboxylic acid with a ketone group, and the reagent used is DIBAL-H (Diisobutylaluminium hydride), which is a selective reducing agent.

DIBAL-H is commonly used to reduce esters, nitriles, and acids to aldehydes under controlled conditions. However, it does not generally reduce ketones fully to alcohols in one step.

In this reaction:

1. DIBAL-H will selectively reduce the ester or acid functionalities to an aldehyde, without affecting the ketone significantly under these controlled conditions.
2. Considering the structure, the carboxylic acid group will be reduced to an aldehyde since DIBAL-H is known for this transformation.

Based on the mechanism of action of DIBAL-H and the functional groups present, the major product formed will be one where the carboxylic acid is reduced to the corresponding aldehyde.

Thus, the correct major product is the one corresponding to the reduction of the carboxylic acid to an aldehyde, leaving the ketone group intact.