Question

The order of basicity among the following compounds is

(A) II > I > IV > III 

(B) IV > II > III > I

(C) IV > I > II > III 

(D) I > IV > III > II

Answer 1

The conjugate acid is stabilized by resonance with two different –NH₂ group. Hence electron density increases on N of = NH

The conjugate acid is stabilized by resonance with one –NH₂ group. Hence as compared to IV lesser increase of electron density on N of = NH

Lone pair is not involvd in aromaticity. Hence more available