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Chemistry Question on Amines

Cyanogen gas is obtained in the reaction

A

\ceCuSO4(aq)+KCN−>\ce{CuSO4_{(aq)} + KCN->}

B

\ceK4[Fe(CN)6]−>[heat]\ce{ K4[Fe(CN)6]->[heat] }

C

\ceCH,CN+H2O−>[Δ]\ce{CH,CN + H2O->[\Delta] }

D

\ceCH3CONH2+P2O5−>[Δ]\ce{CH3CONH2 + P2O5->[\Delta] }

Answer

\ceCuSO4(aq)+KCN−>\ce{CuSO4_{(aq)} + KCN->}

Explanation

Solution

2CuSO4+4KCN→(CN)2+2CuCN+2K2SO42 CuSO _{4}+4 KCN \rightarrow( 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 cyanogen.