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Tautomerism will be exhibited by

1. (CH3)2NH
2. (CH3)3CNO
3. R3CNO2
4. RCH2NO2

Correct answer: RCH2NO2

Solution

Tautomerism occurs when a compound has an acidic hydrogen atom adjacent to a functional group capable of delocalization. In RCH2NO2, the α-hydrogen adjacent to the nitro group can participate in keto-enol tautomerism, making it the correct answer.

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