NEET 2020 · ChemistryCarbonyl reductionPrevious Year Question
The reaction between acetone () and methylmagnesium chloride () followed by hydrolysis gives
Answer: (A) (A) \textit{tert}-butyl alcohol. \textbf{Answer:} (A) \textit{tert}-butyl alcohol.
- A.(A) \textit{tert}-butyl alcohol✓
- B.(B) isobutyl alcohol
- C.(C) isopropyl alcohol
- D.(D) \textit{sec}-butyl alcohol
Correct Answer
(A) (A) \textit{tert}-butyl alcohol
Solution & Explanation
\textbf{Answer:} (A) \textit{tert}-butyl alcohol. \textbf{Solution:} The methyl carbanion of the Grignard reagent adds to the carbonyl carbon of the ketone: . Addition of a Grignard reagent to a ketone always yields a tertiary alcohol, here 2-methylpropan-2-ol (\textit{tert}-butyl alcohol).
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