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Solution


Q.

The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha-carbon, is          [2016]
1 a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation  
2 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  
3 a carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol  
4 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.  

Ans.

(2)

Keto-enol tautomerism :