Which of the following exhibits +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 C $- N H_{2}$
The +R effect or positive resonance effect is exhibited by electron donating groups which donate electrons by delocalisation. In $- N H_{2}$ , the nitrogen atom has a lone pair which participates in resonance and hence makes it a +R group.

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