CBSE Class 12 · 2008 · Foreign · Compounds Containing NitrogenShort Answer

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State the reactions and conditions for the following conversions:
i) benzenediazonium chloride to nitrobenzene
ii) aniline to benzenediazonium chloride
iii) ethanamide to methylamine

Answer: (i) NaNO₂/Cu (or HBF₄ then NaNO₂/Cu, Δ) → C₆H₅NO₂. (ii) NaNO₂ + 2HCl, 273–278 K. (iii) Hofmann bromamide: Br₂/4NaOH.

Solution

(i)

C_{6} H_{5} N_{2}^{+} B F_{4}^{-} NaN O_{2} /Cu, Δ C_{6} H_{5} N O_{2} + N_{2} + NaB F_{4}

(via the fluoroborate).
(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

(iii)

C H_{3} CON H_{2} + B r_{2} + 4NaOH \to C H_{3} N H_{2} + N a_{2} C O_{3} + 2NaBr + 2 H_{2} O

CBSE Class 12 Board · 2008 · Foreign · Subjective

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