Redox reactions are coupled reactions of oxidation and reduction. Reactants that gain electrons are reduced and those whose electrons were lost are oxidized. Reactions that undergo reduction or oxidation may or may not have visible changes in charges and should thus be determined by their oxidation states.
In which of the following reactions does the underlined atom undergo an oxidation?
A. Na → Na+ (Na atom → Na+ ion)
B. Cl → Cl- (Cl atom → Cl- ion)
C. CH3CH2OH → CH3CHO (ethanol → acetaldehyde)
D. CH3CHO → CH3COO- (acetaldehyde → acetic acid)
E. CH2=CH2 → CH3CH3 (ethene → ethane)
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