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NEET 2021 · ChemistryCarbonyl reductionPrevious Year Question

What is the IUPAC name of the organic compound formed in the following reaction?

Answer: (B) (B) 2-methylbutan-2-ol. \textbf{Answer:} (B) 2-methylbutan-2-ol \textbf{Solution:} Ethylmagnesium bromide adds across the carbonyl of acetone .

  1. A.(A) pentan-3-ol
  2. B.(B) 2-methylbutan-2-ol✓
  3. C.(C) 2-methylpropan-2-ol
  4. D.(D) pentan-2-ol

Correct Answer

(B) (B) 2-methylbutan-2-ol

Solution & Explanation

\textbf{Answer:} (B) 2-methylbutan-2-ol \textbf{Solution:} Ethylmagnesium bromide adds across the carbonyl of acetone . After aqueous acidic work-up the alkoxide is protonated to give the tertiary alcohol , i.e. 2-methylbutan-2-ol. Grignard reagents add to ketones to yield tertiary alcohols.

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