CBSE Class 12 · 2003 · Foreign · Compounds Containing NitrogenShort Answer

Illustrate the following with an example reaction in each case:
i) Sandmeyer reaction
ii) coupling reaction

Answer: (i) ArN₂⁺ + CuBr/HBr → ArBr + N₂. (ii) ArN₂⁺ + β-naphthol/OH⁻ → azo dye.

Solution

(i)

C_{6} H_{5} N_{2}^{+} C l^{-} CuBr/HBr C_{6} H_{5} Br + N_{2}

(ii)

C_{6} H_{5} N_{2}^{+} C l^{-} + C_{6} H_{5} OH O H^{-} p - HO C_{6} H_{4} N = N C_{6} H_{5}

CBSE Class 12 Board · 2003 · Foreign · Subjective