question_answer

Tautomerism is not exhibited by:

A)  

B)  

C)  

D)  

Correct Answer: A

Solution :

                For keto-enol-tautomerism a compound should have at least one a-hydrogen atom with respect to ketone group and for tautomerism presence of a-hydrogen atom is essential, does not exhibited tautomerism due to absence of\[\alpha -\]hydrogen atom.