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NEET 2016 Phase 1 · ChemistrySelf-aldolPrevious Year Question

The correct statement regarding a carbonyl compound with a hydrogen atom on its -carbon is:

Answer: (D) (D) A carbonyl compound with a hydrogen atom on its -carbon rapidly equilibrates with its corresponding enol, and this process is known as keto-enol tautomerism.. \textbf{Answer:} (D) The carbonyl rapidly equilibrates with its enol, a process called keto-enol tautomerism.

  1. A.(A) A carbonyl compound with a hydrogen atom on its -carbon never equilibrates with its corresponding enol.
  2. B.(B) A carbonyl compound with a hydrogen atom on its -carbon rapidly equilibrates with its corresponding enol, and this process is known as aldehyde-ketone equilibration.
  3. C.(C) A carbonyl compound with a hydrogen atom on its -carbon rapidly equilibrates with its corresponding enol, and this process is known as carbonylation.
  4. D.(D) A carbonyl compound with a hydrogen atom on its -carbon rapidly equilibrates with its corresponding enol, and this process is known as keto-enol tautomerism.✓

Correct Answer

(D) (D) A carbonyl compound with a hydrogen atom on its -carbon rapidly equilibrates with its corresponding enol, and this process is known as keto-enol tautomerism.

Solution & Explanation

\textbf{Answer:} (D) The carbonyl rapidly equilibrates with its enol, a process called keto-enol tautomerism. \textbf{Solution:} A carbonyl compound bearing an -hydrogen exists in equilibrium with its enol form, in which the -H migrates to the carbonyl oxygen giving a unit. This rapid proton-shift interconversion between the keto and enol forms is keto-enol tautomerism.

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