Consider the following four compounds I, II, III, and IV.

Choose the correct statement(s).

The correct basic strength order is

(A) ${\mathrm{K}}_{\mathrm{b}}:\mathrm{IV}>\mathrm{II}>\mid >\mathrm{III};$

• $\mathrm{IV}$ is strongest base due to SIR effect.
• $\mathrm{III}$ is weakest base due to$-\mathrm{M}$ group of three nitro groups present at Ortho and Para positions.
• $\mathrm{Il}$ is stronger than $\mathrm{I}$ since $\mathrm{III}$ is tertiary and $\mathrm{I}$ primary aromatic amine.

(B) $\mathrm{IV}$ is found to be $40,000$ times more basic than $\mathrm{III}$. While $\mathrm{I}$ and $\mathrm{II}$ differ very little in basic strength.

(C,D) Due to SIR effect in $\mathrm{IV}$ both $-{\mathrm{NO}}_2$ and $-\mathrm{N}{\left({\mathrm{CH}}_3\right)}_2$ will be out of plane hence resonance effect is more in $\mathrm{III}$ than in $\mathrm{IV}$.
in III than in $\mathrm{V}$.