Which of the following has +R (resonance) effect?

- C N

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- C H O

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- {N H}_{2}

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- {N O}_{2}

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Solution

The correct option is B $- {N H}_{2}$
The electron withdrawing or releasing effect of a substituent through delocalization of $π$ electrons, is known as resonance effect.
In $- N H_{2}$ , $N$ has a lone pair of electron and it can transfer this pair to conjugated $π$ bond. Since the electron pair is transferred away from $- N H_{2}$ , it has +R effect.

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