Pure aniline is a

$A$ reaction of $0.1 \ mol$ of Benzylamine with bromomethane gave $23 \ g$ of Benzyl trimethyl ammonium bromide. The number of moles of bromomethane consumed in this reaction are $n \times 10^{-1},$ when $n = \dots$ (Round off to the Nearest Integer).
(Given : Atomic masses: $C : 12.0 \ u, H : 1.0 \ u, N : 14.0 \ u, Br : 80.0 \ u$)

Identify $Y$ in the following reaction sequence:
$C_6H_5NH_2$ $\xrightarrow[5^{\circ}C]{NaNO_2 + HCl} X$ $\xrightarrow{H_3PO_2 / H_2O} Y$

When propionamide reacts with $Br_2$ in the presence of alkali the product is :

Which of the following statements is true?
$1)$ Tertiary amines react with acid chlorides.
$2)$ $N$-ethylbenzene sulphonamide is soluble in alkali.
$3)$ $N,N$-diethylbenzene sulphonamide is soluble in alkali.
$4)$ Tertiary amines react with Hinsberg's reagent.

Which of the following is most reactive towards electrophile?