MCQ
Which one is not called a anode reaction from the following
- A$C{l^ - }\, \to \,\frac{1}{2}C{l_2} + {e^ - }$
- B$Cu\, \to \,C{u^{ + 2 }} + 2{e^ - }$
- C$H{g^ + }\, \to \,H{g^{ + 2 }} + {e^ - }$
- ✓$Z{n^{2 + }} + 2{e^ - }\, \to \,Zn$

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$\begin{array}{*{20}{c}}
{^{C{H_3}}} \\
{_H}
\end{array}\begin{array}{*{20}{c}}
{{\text{ }}\backslash {\text{ }}} \\
/
\end{array}\mathop C\limits^{} {\mkern 1mu} = \mathop C\limits^{} {\mkern 1mu} \begin{array}{*{20}{c}}
/ \\
{{\text{ }}\backslash {\text{ }}}
\end{array}_{\mathop C\limits^{} {\kern 1pt} \equiv \mathop C\limits^{} {\kern 1pt} - \mathop C\limits^{} {\kern 1pt} {H_2}\mathop C\limits^{} {\kern 1pt} {H_3}}^H{\mkern 1mu} $