What is the increasing order of basic strength of the following compounds in aqueous solution?

In aqueous solution, amine basically follows the order NH3 < tertiary < primary < secondary This is due to the combined effect of induction andstabilization of conjugate acid through H-bonding. Also, a cyclic amine is more basic (lV) than acyclic amine (II). If their degrees are same. Hence, the overall order is Kb:  III  30 <  110 < II 20,  acyclic  <  IV  20,  cyclic.