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Cyanogen gas is obtained in the reaction

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${CuSO}_{4 (aq)} + KCN \to$

$K_{4} [Fe (CN)_{6}] \overset{heat}{⟶}$

${CH}_{3} CN + H_{2} O \overset{Δ}{⟶}$

${CH}_{3} {CONH}_{2} + P_{2} O_{5} \overset{Δ}{⟶}$

answer is A.

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Detailed Solution

$2 {CuSO}_{4} + 4 KCN \to (CN)_{2} + 2 CuCN + 2 K_{2} {SO}_{4}$

On combining solution of copper (II) salts and cyanides, an unstable copper (III) cyanide is formed which rapidly decomposes into copper (I) cyanide and cyanogens.

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