Explain the reaction of diazotization with suitable examples.

(N/A) The conversion of primary aromatic amines into diazonium salts is known as diazotization. $C_6H_5NH_2 + NaNO_2 + 2HCl \xrightarrow{273-278 \ K} C_6H_5N_2^+Cl^- + NaCl + 2H_2O$.
Benzenediazonium chloride is prepared by the reaction of aniline with nitrous acid at $273-278 \ K$. Nitrous acid is produced in the reaction mixture by the reaction of sodium nitrite with hydrochloric acid.
Due to its instability,the diazonium salt is not generally stored and is used immediately after its preparation. Examples include benzenediazonium chloride and benzenediazonium hydrogen sulphate.