Which of the following substances will have the lowest boiling point?

Select the percentage in which these amine derivatives are formed in the reaction mixture along with the reason for the nitration of aniline:

The diazonium salt of which of the following compounds will form a coloured dye on reaction with $\beta$-Naphthol in $NaOH$?

$A$ student performed an analysis of an aliphatic organic compound '$X$' which, upon analysis, gave $C=61.01\%$, $H=15.25\%$, $N=23.74\%$. This compound, on treatment with $HNO_2/H_2O$, produced another compound '$Y$' which did not contain any nitrogen atom. However, the compound '$Y$' upon controlled oxidation produced another compound '$Z$' that responded to the iodoform test. The structure of '$X$' is:

Identify $X$ and $Y$ in the following reactions:

What is produced when aniline is heated with chloroform and alcoholic $KOH$?