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

• 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.

• a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation

• 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

• a carbonyl compound with a hydrogen atom on its alpha carbon never equilibrates with its corresponding enol