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Considering the basic strength of amines...

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

A

`(CH_3)_2NH`

B

`CH_3 NH_2`

C

`(CH_3)_3N`

D

`C_6H_5NH_2`

Text Solution

Verified by Experts

The correct Answer is:
A
Order of basic strength of aliphatic amine in aqueous solution is as follows (order of `K_b`)
`(CH_3)_2overset(* *)NH gt CH_3 overset(* *)NH_2 gt (CH_3)_3overset(* *)N gt C_6 H_5 overset(* *)NH_2`
As we know `pK_b = - log K_b`
`Less is the `pK_b` value, more is the basic strength.
so` (CH_3)_2overset(* *)NH` will have smallest `pK_b` value.
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