Question

The order of basicity among the following compounds is

• A. II > I > IV > III
• B. I > IV > III > II
• C. IV > II > III > I
• D. IV > I > II > III

Answer 1

Answer: (D)

The conjugate acid is stabilized by resonance with two different $-N{H}_2$ group.
The conjugate acid is stabilized by resonance with one $-N{H}_2$ group and by hyper conjugation of $-C{H}_3$ group.
The conjugate acid is stabilized by resonance with only one $N{H}_2$ group.
(III) Least basic, as the LP is used in aromaticity.