Question

Nucleophilic addition of Grignard reagent to ketones followed by hydrolysis with dilute acids forms:

• A. Alkene
• B. Primary alcohol
• C. Tertiary alcohol
• D. Secondary alcohol

Answer 1

The Correct Option is C

The reaction of a Grignard reagent (RMgX) with a ketone results in the formation of a tertiary alcohol. The mechanism involves the nucleophilic attack of the Grignard reagent on the carbonyl carbon of the ketone, followed by hydrolysis to yield a tertiary alcohol. This is because the Grignard reagent adds a second alkyl group to the carbonyl carbon, resulting in a tertiary alcohol.

Mechanism:

1. Grignard reagent attacks the carbonyl carbon of the ketone to form a tetrahedral intermediate.
2. Hydrolysis of the intermediate yields a tertiary alcohol.