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

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 4 lt 3`

D

`1 lt 3 lt 2 lt 4`

Verified by Experts

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

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