The correct statement regarding a carbonyl
compound with a hydrogen atom on its
alphacarbon,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 hydrgen 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.