Select the correct sequence of reagents for the above conversion.

The correct decreasing order of ${\mathrm{pK}}_{\mathrm{b}}$ is:-

Correct decreasing order of ${\mathrm{pK}}_{\mathrm{b}}$ value of following compounds:-

($\mathrm{I}$)

($\mathrm{II}$) ${\mathrm{CH}}_3-\stackrel{\bullet \bullet }{\mathrm{N}}{\mathrm{H}}_2$

($\mathrm{III}$) ${\mathrm{CH}}_3-\stackrel{\bullet \bullet }{\mathrm{N}}\mathrm{H}-{\mathrm{CH}}_3$

($\mathrm{IV}$) ${\mathrm{CH}}_3-\underset{\stackrel{|}{{\mathrm{CH}}_3}}{\stackrel{\bullet \bullet }{\mathrm{N}}}-{\mathrm{CH}}_3$

Decreasing order of basic strength is :-

($\mathrm{I}$) ${\mathrm{CH}}_3{\mathrm{NH}}_2$

($\mathrm{II}$) ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2{\mathrm{NH}}_2$

($\mathrm{III}$) $\mathrm{p}-{\mathrm{CH}}_3\mathrm{O}-{\mathrm{C}}_6{\mathrm{H}}_4-{\mathrm{NH}}_2$

($\mathrm{IV}$) $\mathrm{m}-{\mathrm{CH}}_3\mathrm{O}-{\mathrm{C}}_6{\mathrm{H}}_4-{\mathrm{NH}}_2$

The correct order of ${\mathrm{K}}_{\mathrm{b}}$ is

(i)

(ii)

(iii) ${\mathrm{CH}}_3{\mathrm{CH}}_2-{\mathrm{NH}}_2$

(iv) ${\mathrm{H}}_3\mathrm{C}-\underset{\stackrel{\left|\right|}{\mathrm{O}}}{\mathrm{C}}-{\mathrm{NH}}_2$

In pyrrole

The electron density is maximum on:

The correct increasing order of basic strength for the following compounds is: