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Which of the following shows nitro-aci tautomerism?

A $C X_{6} H X_{5} NO X_{2}$
B $(CH X_{3}) X_{3} C - NO X_{2}$
C $CCl X_{3} NO X_{2}$
D $CH X_{3} NO X_{2}$

Answer: D

Nitro-aci tautomerism requires a hydrogen on the carbon bonded to the nitro group.

CH X_{3} NO X_{2}

has three such hydrogens and gives the aci form

CH X_{2} = N (O) OH

. The other three compounds have no such hydrogen.

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