The correct order of +M effect of 'N' containing functional group on benzene ring amongst the given compounds is:

Engineering

Chemistry

Inductive Effect

Resonance

Basic Concepts of GOC

Question

The correct order of +M effect of 'N' containing functional group on benzene ring amongst the given compounds is:

i > ii > iv > iii

ii > i > iii > iv

i > ii > iii > iv

iv > iii > ii > i

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The +M (mesomeric) effect refers to electron donation via resonance. Nitrogen groups donate electrons if they have a lone pair, but the donation strength depends on how attached atoms affect that lone pair's availability.

Key order: $N (C H_{3})_{2}$ (i, strong) > $N H C H_{3}$ (ii) > $N H_{3} +^{-}$ (iv, no lone pair) > $N O 2$ (iii, electron-withdrawing).

Final answer: i > ii > iv > iii