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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3g2204

Which of the following can show nitro-aci tautomerism?

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

Answer: A, B

A hydrogen on the carbon carrying the nitro group is needed.

CH X_{3} NO X_{2}

(3 H) and

(CH X_{3}) X_{2} CHNO X_{2}

(1 H) have it. In

(CH X_{3}) X_{3} C - NO X_{2}

and

C X_{6} H X_{5} NO X_{2}

the carbon bonded to

NO X_{2}

carries no hydrogen, so they do not.

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