Importance of Diazonium Salts in Synthetic Organic Chemistry

Which of the following reaction condition will convert diazonium salt to phenol?

Balz–Schiemann reaction is used to convert primary aromatic amine to aniline.

Diazonium salt on reaction with hypophosphorous acid gives

Identify the reagent used in the following conversion:

${\mathrm{C}}_6{\mathrm{H}}_5{\stackrel{+}{\mathrm{N}}}_2\stackrel{-}{\mathrm{Cl}}\stackrel{ ? }{\to }{\mathrm{C}}_6{\mathrm{H}}_5\mathrm{CN}+{\mathrm{N}}_2$

Identify $\left[\mathrm{A}\right]$ and $\left[\mathrm{B}\right]$ in the following chemical reactions.

${\mathrm{C}}_6{\mathrm{H}}_5{{\mathrm{N}}_2}^{+}{\mathrm{Cl}}^{-}\underset{{\mathrm{NaNO}}_2}{\overset{\mathrm{Cu}}{\to }}\left[\mathrm{A}\right]\underset{6\left[\mathrm{H}\right]}{\overset{\mathrm{Sn}/\mathrm{HCl}}{\to }}\left[\mathrm{B}\right]$

A dye obtained by the reaction of reactant $\mathrm{X}$ with benzene diazonium chloride. The reactant $\mathrm{X}$ is-

Cotyledons are also called-

Balz–Schiemann reaction is used to convert primary aromatic amine to aniline.

An example of anthraquinone dye is

Identify '$\mathrm{C}$' in the following reaction: