CBSE Class 12 · 2002 · Foreign · Compounds Containing NitrogenShort Answer

Illustrate each of the following with an example reaction:
i) Sandmeyer reaction
ii) diazotisation reaction

Answer: (i) C₆H₅N₂⁺Cl⁻ + CuCl/HCl → C₆H₅Cl + N₂. (ii) C₆H₅NH₂ + NaNO₂ + 2HCl (0–5 °C) → C₆H₅N₂⁺Cl⁻.

Solution

(i)

C_{6} H_{5} N_{2}^{+} C l^{-} CuCl/HCl C_{6} H_{5} Cl + N_{2} ↑

(CuBr/HBr gives bromobenzene similarly).
(ii)

C_{6} H_{5} N H_{2} + NaN O_{2} + 2HCl 273 - 278K C_{6} H_{5} N_{2}^{+} C l^{-} + NaCl + 2 H_{2} O

CBSE Class 12 Board · 2002 · Foreign · Subjective