NEET 2020 · ChemistryPrevious Year Question
Reaction between acetone and methylmagnesium chloride, followed by hydrolysis, will give:
Answer: (A) (A) tert-Butyl alcohol. The Grignard reagent adds its methyl carbanion to the carbonyl carbon of acetone , giving an alkoxide .
- A.(A) tert-Butyl alcohol✓
- B.(B) Isobutyl alcohol
- C.(C) Isopropyl alcohol
- D.(D) sec-Butyl alcohol
Correct Answer
(A) (A) tert-Butyl alcohol
Solution & Explanation
The Grignard reagent adds its methyl carbanion to the carbonyl carbon of acetone , giving an alkoxide . Acidic hydrolysis then gives , i.e. 2-methylpropan-2-ol = tert-butyl alcohol (a tertiary alcohol, since the carbonyl was a ketone).
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