Which of the following amines is the weakest base?

Identify the major product formed in the following sequence of reactions:
Aniline $\xrightarrow{Br_2/H_2O}$ $2,4,6-$Tribromoaniline $\xrightarrow{NaNO_2/HCl}$ $2,4,6-$Tribromobenzenediazonium chloride $\xrightarrow{H_3PO_2/H_2O}$ Product.

What is the nature of an aqueous solution of methylamine?

The correct order of decreasing basic strength of the given amines is:

Identify the final product $Z$ in the following reaction sequence:

Identify the product of the following reaction:
$\text{Aniline} \xrightarrow[ii) \text{H}_2\text{O}, \Delta]{i) \text{NaNO}_2 + \text{HCl}, 273 \text{ K}} \text{Product}$