Which is the weakest Bronsted base?

Assertion $(A)$: $-NH_2$ group of aniline is ortho,para directing in electrophilic substitutions.
Reason $(R)$: $-NH_2$ group stabilises the arenium ion formed by the ortho,para attack of the electrophile.
The correct answer is

Consider the following:
Statement-$I$: In the nitration of aniline,a significant amount of $m$-nitroaniline is formed.
Statement-$II$: In the presence of a strongly acidic medium,aniline is protonated to form the anilinium ion,which is meta-directing.

Give the structure of $A$ in the following reaction.
$2\text{-Nitro-4-methylaniline} \xrightarrow[(ii) \ H_3PO_2, H_2O]{(i) NaNO_2 + HCl, 273 - 278 \ K} A$.

Consider the following reaction:
$C_6H_5NO_2$ $\xrightarrow{Sn/HCl} X$ $\xrightarrow{C_6H_5COCl} Y + HCl$
What is $Y$?

The order of basic strength among the following amines in benzene solution is