Considerin the basic strength of amines in aqueous solution, which one has the smallest `pK_(b)` value?

Options

A. `(CH_(3))_(2)NH`
B. `CH_(3)NH_(2)`
C. `(CH_(3))_(3)N`
D. `C_(6)H_(5)NH_(2)`

Answer

A

Explanation

Lower is `pK_(b)` value strong is basic nature so order of basic strength of Aliphatic amine in aqueous solution is as follows.
`(CH_(3))_(2)overset(**)(N)HgtCH_(3)overset(**)(N)H_(2)gt(CH_(3))_(3)overset(**)(N)gtC_(6)H_(5)overset(**)(N)H_(2)`
As we know `pK_(b)=-"log"k_(b)`.