In the reaction: $\text{Primary Amine} + CHCl_3 + KOH \rightarrow \text{Product}$,what is the product?

Consider the following four compounds $I, II, III,$ and $IV$.
Choose the correct statement$(s)$.
$(A)$ The order of basicity is $II > I > III > IV$.
$(B)$ The magnitude of $pK_b$ difference between $I$ and $II$ is more than that between $III$ and $IV$.
$(C)$ Resonance effect is more in $III$ than in $IV$.
$(D)$ Steric effect makes compound $IV$ more basic than $III$.

Identify an aromatic,mixed,$3^{\circ}$ amine among the following compounds.

With which of the following compounds does aniline react to form a Schiff base?

The missing reagent is:

Product $(B)$ in this reaction is