Benzene Diazonium Chloride

Aniline, when diazotized in cold and when treated with dimethylaniline, gives a coloured product. Its structure will be:

In the diazotization of arylamines with sodium nitrite and hydrochloric acid, an excess of hydrochloric acid is used primarily to

What is the product of the following series of reactions?

${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_2 \underset{0°\mathrm{C}}{\overset{{\mathrm{NaNO}}_2/\mathrm{HCl}}{\to }}\mathrm{X}\stackrel{\mathrm{CuCN}}{⟶}\mathrm{Y}\stackrel{{\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}}{⟶}\mathrm{Z},$ $\mathrm{Z}$ is identified as:

The indicator that is obtained by coupling the diazonium salt of sulphanilic acid with $\mathrm{N},\mathrm{N}$ -dimethylaniline is:

Benzenediazonium chloride on reaction with phenol in a weakly basic medium gives:

The reaction of ${\mathrm{C}}_6{\mathrm{H}}_5 {\mathrm{N}}_2{}^{+}\mathrm{Cl}^{-}$ with $\mathrm{CuCl}$ gives:

Which of the following reagent can be used to convert benzenediazonium chloride into benzene?

Aniline on treatment with $\mathrm{HCl}$ and ${\mathrm{NaNO}}_2$ gives

Diazonium salts are the reaction products between nitrous acid and