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

1. A. a carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol.
2. B. 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. C. 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. D. 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.

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