Which of the following is $NOT$ an anode reaction?
- A$Cl^{-} \to \frac{1}{2}Cl_{2} + e^{-}$
- B$Cu \to Cu^{2+} + 2e^{-}$
- C$Hg^{+} \to Hg^{2+} + e^{-}$
- D$Zn^{2+} + 2e^{-} \to Zn$
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