p-Block elementsHard

Question

Cyanogen gas is obtained in the reaction

Options

A.CuSO4(aq) + KCN →
B.K4 [Fe(CN)6]
C.CH3CN + H2O
D.CH3CONH2P2O5

Solution

Among the given options, only CuSO4(aq.) and KCN react to form an unstable copper (II) cyanide which redidly decomposes to give copper (I) cyanide and cyanogen.
SO2CuSO4 (aq) + 4KCN → 2Cu(CN)2 + 2K24
2Cu(CN)2 → 2CuCN+ (CN)2
                                        Cyanigen

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