Yellow dye can be prepared by a coupling reaction of benzene diazonium chloride in acidic medium with $X$. Identify $X$ from the following.

$X$ and $Y$ (major products) in the following reaction sequence are:

Identify the amine formed when $ethyltrimethyl$ ammonium iodide is treated with silver hydroxide and further heated strongly.

Complete the following reaction: $R-NH_2 + H_2SO_4 \to$

Which of the following is the most basic compound?

Write structures of different isomers corresponding to the molecular formula $C_{3}H_{9}N$. Write $IUPAC$ names of the isomers which will liberate nitrogen gas on treatment with nitrous acid.