Highest value of $pK_b$ will be of :

Given below are two statements:
Statement $I$: Heating benzamide with bromine in an ethanolic solution of sodium hydroxide will give benzylamine.
Statement $II$: Nitration of aniline with $HNO_3/H_2SO_4$ at $288 \ K$ produces $m$-nitroaniline in higher amount than $o$-nitroaniline (pH adjusted).

With respect to the following reaction,consider the given statements:
$C_6H_5NH_2 \xrightarrow{HNO_3, H_2SO_4, 288 \ K} \text{products}$
$(A)$ $o$-Nitroaniline and $p$-nitroaniline are the predominant products.
$(B)$ $p$-Nitroaniline and $m$-nitroaniline are the predominant products.
$(C)$ $HNO_3$ acts as an acid.
$(D)$ $H_2SO_4$ acts as an acid.

Identify the correct decreasing order of $pK_b$ values of the following compounds.

When an organic compound was treated with sodium nitrite and hydrochloric acid in the ice-cold condition,nitrogen gas was evolved copiously. The compound is

The correct order of basic strength of methyl-substituted amines in an aqueous medium is: