Complete the following equations: C 6 H 5 N 2 Cl → HCl CuCl .

C 6 H 5 N 2 Cl → HCl CuCl C 6 H 5 Cl + N 2 . It is known as Sandmeyer's reaction. When, benzenediazonium chloride solution is added to a solution of cuprous chloride dissolved in HCl , the diazo group is replaced by chlorine resulting in the formation of chlorobenzene.

Complete the following equations: C 6 H 5 OH → OH - ArN 2 + Cl - .

C 6 H 5 OH → OH - ArN 2 + Cl - Ar - N = N - C 6 H 4 - OH + HCl . Arene diazonium salts react with electron rich (highly reactive) aromatic compounds such as phenols and amines to form brightly coloured azo compounds, Ar - N = N - Ar . This reaction is known as Coupling reaction. Azo compounds are used as dyes. Coupling takes place almost exclusively at the para position if it is unoccupied. If it is not, then coupling takes place at ortho position. Coupling with phenols occurs in basic medium ( pH 9 - 10 ) whereas, with amines it occurs in faintly acidic medium ( pH 4 – 5 ) at 273 - 278 K .

Complete the following equations: C 6 H 5 N 2 Cl + ArNH 2 → pH 4 - 5 ice cold .

C 6 H 5 N 2 Cl + ArNH 2 → pH 4 - 5 ice cold C 6 H 5 - N = N - C 6 H 4 - NH 2 + HCl . Arene diazonium salts react with electron rich (highly reactive) aromatic compounds such as phenols and amines to form brightly coloured azo compounds, Ar - N = N - Ar . This reaction is known as Coupling reaction. Azo compounds are used as dyes. Coupling takes place almost exclusively at the para position if it is unoccupied. If it is not, then coupling takes place at ortho position. Coupling with phenols occurs in basic medium ( pH 9 - 10 ) whereas, with amines it occurs in faintly acidic medium ( pH 4 – 5 ) at 273 - 278 K .