The increasing order of pK(b) for the fo...

The increasing order of `pK_(b)` for the following amines is:

A

`3 lt 2 lt 4 lt 1`

B

`1 lt 2 lt 3 lt 4`

C

`1 lt 2 lt 4lt3`

D

`1 lt 3 lt 2 lt 4`

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The correct Answer is:

C

is least basic due to both `-M` and -I effect of `NO_(2)` group.
:. `pK_(b) prop (1)/(K_(b)),` (3) has highest `pK_(b)`.

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