Which of the following groups exhibits (+)R e | vedclass

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(A) The $(+)R$ effect (positive resonance effect) is shown by groups that donate electron density to the conjugated system through resonance.This typi

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$-NHR$

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(A) The $(+)R$ effect (positive resonance effect) is shown by groups that donate electron density to the conjugated system through resonance.This typically occurs when the atom directly attached to the conjugated system possesses at least one lone pair of electrons.Among the given options,the $-NHR$ group has a lone pair on the nitrogen atom,which it can donate to the conjugated system,thus exhibiting the $(+)R$ effect.The other groups ($-CN$,$-NO_2$,and $-COOR$) are electron-withdrawing groups that exhibit the $(-)R$ effect.

Which of the following groups exhibits $(+)R$ effect?

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