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_(3)NH_(2) lt NH_(3) lt (CH_(3))_(2)NH`
B. `CH_(3)NH_(2) lt (CH_(3))_(2)NH lt NH_(3)`
C. `(CH_(3))_(2)NH lt NH_(3) lt CH_(3)NH_(2)`
D. `NH_(3) lt (CH_(3))_(2)NH lt CH_(3)NH_(2)`

Answer

D

Explanation

Due to +I effect of methyl group, `2^(@)` amines are more basic than `1^(@)` amine.
Hence, order of basicity of methyl amines in aqeuous solution is :
`NH_(3) lt CH_(3)NH_(2) lt (CH_(3))_(2)NH_(2)`