Trong các sơ đồ sau, sơ đồ nào sai (mỗi mũi tên là một phản ứng)?
A. $\displaystyle \text{Cu}\to \text{CuC}{{\text{l}}_{\text{2}}}\text{ }\!\!~\!\!\text{ }\to \text{ }\!\!~\!\!\text{ CuS}{{\text{O}}_{\text{4}}}\text{ }\!\!~\!\!\text{ }\to \text{ }\!\!~\!\!\text{ CuS}\to \text{ }\!\!~\!\!\text{ CuO}$
B. $\displaystyle \text{Cu }\to ~\text{Cu(N}{{\text{O}}_{\text{3}}}{{\text{)}}_{\text{2}}}\text{ }\!\!~\!\!\text{ }\to ~\text{CuO }\to ~\text{C}{{\text{u}}_{\text{2}}}\text{O }\to ~\text{Cu}$
C. $\displaystyle \text{CuC}{{\text{O}}_{\text{3}}}\text{ }\!\!~\!\!\text{ }\to \text{ }\!\!~\!\!\text{ Cu}{{\left( \text{OH} \right)}_{\text{2}}}\to \text{ CuC}{{\text{l}}_{\text{2}}}\text{ }\!\!~\!\!\text{ }\to \text{ }\!\!~\!\!\text{ Cu}{{\left( \text{OH} \right)}_{\text{2}}}\text{ }\!\!~\!\!\text{ }\to ~\text{CuO }\to ~\text{Cu}$
D. $\displaystyle \text{Cu }\to ~\text{CuC}{{\text{l}}_{\text{2}}}\text{ }\!\!~\!\!\text{ }\to \text{ }\!\!~\!\!\text{ CuS }\to ~\text{CuC}{{\text{l}}_{\text{2}}}~\to ~\text{Cu}$
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