Which of the following groups does not show ( | vedclass

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(C) The $(+R)$ effect (positive resonance effect) is shown by groups that donate electrons through resonance,typically having a lone pair of electrons

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$-CN$

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(C) The $(+R)$ effect (positive resonance effect) is shown by groups that donate electrons through resonance,typically having a lone pair of electrons on the atom directly attached to the conjugated system.$-NH_2$,$-NHCOR$,and $-NR_2$ all possess a lone pair on the nitrogen atom and thus exhibit the $(+R)$ effect.$-CN$ contains a multiple bond between carbon and nitrogen,which acts as an electron-withdrawing group via resonance,thus showing the $(-R)$ effect.

Which of the following groups does not show $(+R)$ effect?

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