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Question

Which of the following functional group shows +R effect?

A
CHO
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B
NO2
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C
CN
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D
NR2
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Solution

The correct option is D NR2
+R effect is shown by the group which has a lone pair of electrons and can give away its electrons.
CHO,NO2,CN - all show R effect because they do not contain lone pairs and also withdraw electrons towards the group.
NR2 has one lone pair, so it can give away its electrons and hence, it show +R effect.

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