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Which of the following compounds can exhibit keto-enol tautomerism?

A $CH X_{3} COCH X_{3}$
B $C X_{6} H X_{5} CHO$
C $(CH X_{3}) X_{3} C - CHO$
D $HCHO$

Answer: A

Keto-enol tautomerism needs a hydrogen on the carbon alpha to the carbonyl group.

CH X_{3} COCH X_{3}

has six alpha hydrogens.

C X_{6} H X_{5} CHO

,

(CH X_{3}) X_{3} C - CHO

and

HCHO

have no alpha hydrogen, so they cannot enolise.

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