The correct order of increasing basic nature for the bases `NH_3 CH_3NH_2 and (CH_3)_2 NH` in aqueous solution

Options

A. `CH_3NH_2 lt NH_3 lt (CH_2)_2NH`
B. `(CH_3)_2NH lt NH_3 lt CH_3NH_2`
C. `NH_3 lt CH_3 NH_2 lt (CH_2)_2NH lt NH`
D. `CH_3NH_2 lt (CH_3)_2 NH lt NH_3`

Answer

C

Explanation

If the alkyl group 1S bigger than CH3 group there is steric hindrance to H-bonding and hence + 1 effect predominates over H-bonding `2 gt 3 gt 1`
There 18 an important role of the inductive effect, solvation effect and steric hindrane of alkyl group. Which decide the basic strength of alkyl amine in the aqueous state. `(CH_3)_2 NH gt CH_3 OI H_2 gt NH_3`