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NEET 2021 · ChemistryPrevious Year Question

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

Answer: (B) (B) 2-methylbutan-2-ol. \textbf{Answer:} (B) 2-methylbutan-2-ol \textbf{Solution:} A Grignard reagent adds to the carbonyl carbon of a ketone; aqueous acidic work-up gives a tertiary alcohol.

  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:} A Grignard reagent adds to the carbonyl carbon of a ketone; aqueous acidic work-up gives a tertiary alcohol. Acetone reacting with adds an ethyl group to the carbonyl carbon: . This 3 alcohol has a 4-carbon main chain (butan-2-ol) with a methyl branch at C-2, giving 2-methylbutan-2-ol.

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