# The increasing order of

Question:

The increasing order of $\mathrm{p} K_{\mathrm{b}}$ values of the following compounds is :

1. $\mathrm{II}<\mathrm{IV}<\mathrm{III}<\mathrm{I}$

2. $\mathrm{I}<\mathrm{II}<\mathrm{IV}<\mathrm{III}$

3. $\mathrm{II}<\mathrm{I}<\mathrm{III}<\mathrm{IV}$

4. $\mathrm{I}<\mathrm{II}<\mathrm{III}<\mathrm{IV}$

Correct Option: , 2

Solution: