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
SO2CuSO4 (aq) + 4KCN → 2Cu(CN)2 + 2K24
2Cu(CN)2 → 2CuCN+ (CN)2
Cyanigen
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