Single Choice

Which of the following functional group shows $$+R$$ effect?

A$$-CHO$$
B$$-NO_{2}$$
C$$-CN$$
D$$-NR_{2}$$
Correct Answer

Solution

$$+R$$ effect is shown by the group which has a lone pair of electrons and can give away its electrons.
$$\Rightarrow -CHO,-NO_{2},-CN$$ - all show $$-R$$ effect because they do not contain lone pairs and also withdraw electrons towards the group.
$$\Rightarrow -NR_{2}$$ has one lone pair, so it can give away its electrons and hence, it show $$+ R$$ effect.

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