The correct order of basicity is

Step-by-step solution

C H 3 N ¨ H 2 (Aliphatic amines) Most basic due to +I effect of methyl group. Methoxy group provides electron density (+M)- N H 2 - N O 2 group with draws electron density from N of - N H 2 C H 3 N ¨ H 2 Most basic because NH 2 connected with sp 3 C while in i,ii&iii Connected with sp 2 C & basic strength ∝ +M/+I basic strength ∝ 1 − M ∝ 1 − I NO 2 exert -M so least basic while -OCH 3 exert +M so more basic M effect is a stronger effect than the effect