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

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

Correct answer: A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism.

Solution

Keto-enol tautomerism is the rapid equilibrium between a carbonyl compound and its enol form, facilitated by the presence of an alpha-hydrogen.

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