Consider the following four compounds I, II, III, and IV.
Select ALL correct options:
A
The order of basicity is II > I > III > IV.
B
The magnitude of $\mathrm{p} K_{\mathrm{b}}$ difference between $\mathbf{I}$ and $\mathbf{I I}$ is more than that between $\mathbf{I I I}$ and $\mathbf{I V}$.
C
Resonance effect is more in III than in IV.
D
Steric effect makes compound IV more basic than III.
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