High School

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A tertiary alcohol is obtained by the reaction of a Grignard reagent with:

a) Butanone
b) Propanone
c) Acetone
d) All of the above

Answer :

Final answer:

Tertiary alcohols can be synthesized by reacting Grignard reagents with ketones. Butanone, propanone, and acetone are all ketones capable of undergoing this reaction to form tertiary alcohols. Therefore, the correct answer is 'd) All of the above'.

Explanation:

A tertiary alcohol is obtained by the reaction of a Grignard reagent with a ketone. This conversion involves the Grignard reagent adding to the carbonyl compound to form a new tertiary alcohol. Specifically, when Grignard reagents react with ketones, they add to the carbonyl group twice. The first step produces a ketone intermediate, then the Grignard reagent adds again to form the tertiary alcohol. Chemically, the compounds butanone (a), propanone (b), and acetone (c) are all ketones, and thus, all these can react with Grignard reagents to yield tertiary alcohols.

Based on the provided reaction mechanisms and examples, the correct answer to the student's query would then be 'd) All of the above' since butanone, propanone, and acetone can all undergo reaction with a Grignard reagent to produce a tertiary alcohol.

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