A) \[{{K}_{3}}[Cu{{(CN)}_{4}}]\]
B) \[CuCN\]
C) \[Cu{{(CN)}_{2}}\]
D) \[{{K}_{2}}[Cu{{(CN)}_{4}}]\]
Correct Answer: A
Solution :
\[CuS{{O}_{4}}+2KCN\xrightarrow{{}}{{K}_{2}}S{{O}_{4}}+\,\,\underset{\begin{smallmatrix} cupric\text{ }cyanide \\ (unstable) \end{smallmatrix}}{\mathop{Cu{{(CN)}_{2}}}}\,\] \[2\,Cu{{(CN)}_{2}}\xrightarrow{{}}\underset{white\text{ }ppt}{\mathop{2CuCN}}\,+{{(CN)}_{2}}\] \[3KCN+CuCN\xrightarrow{{}}\underset{\begin{smallmatrix} potassium\text{ }cuprocyanide \\ (solublecomplex) \end{smallmatrix}}{\mathop{{{K}_{3}}\,[Cu\,\,{{(CN)}_{4}}]}}\,\]
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