Which of the following group will show $+ R$ effect?

- C H O

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- N H_{2}

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- N O_{2}

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- C O C H_{3}

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Solution

The correct option is B $- N H_{2}$
$- N H_{2}$ is an electron-donating group among the four groups since it can donate lone pair. Therefore, it will show $+ R$ or $+ M$ effect.

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