Diazonium Salts

Complete the following reaction: ${\mathrm{C}}_6{\mathrm{H}}_5{{\mathrm{N}}_2}^{+}{\mathrm{Cl}}^{-}\underset{\left(\mathrm{ii}\right) {\mathrm{NaNO}}_2/\mathrm{Cu},∆}{\overset{\left(\mathrm{i}\right) {\mathrm{HBF}}_4}{\to }}$

Complete the following reaction:

${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{N}}_2\mathrm{Cl}+{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}⟶$

Complete the following reaction: ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{N}}_2\mathrm{C}\mathrm{l}+{\mathrm{H}}_3\mathrm{P}{\mathrm{O}}_2+{\mathrm{H}}_2\mathrm{O}⟶$

Give the structures of A, B and C in the following reactions:

Accomplish the following conversion: Aniline to $2,4,6$-tribromofluorobenzene.

Write short note on the following: Coupling reaction.
 

Write short note on the following: Diazotisation.
 

How will you convert:

 Propanoic acid into ethanoic acid

Account for the following: Diazonium salts of aromatic amines are more stable than those of aliphatic amines.

Give one chemical test to distinguish between the following pair of compounds: Ethylamine and aniline.