A. CH3CHO+2 e−+2 H2O→CH3CH2OH+2 OH−\mathrm{CH}_{3} \mathrm{CHO}+2 \mathrm{~e}^{-}+2 \mathrm{~H}_{2} \mathrm{O} \rightarrow \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}+2 \mathrm{~OH}^{-}CH3CHO+2 e−+2 H2O→CH3CH2OH+2 OH−
B. CH3CHO+3 OH−→CH3COO−+2 e−+2 H2O\mathrm{CH}_{3} \mathrm{CHO}+3 \mathrm{~OH}^{-} \rightarrow \mathrm{CH}_{3} \mathrm{COO}^{-}+2 \mathrm{~e}^{-}+2 \mathrm{~H}_{2} \mathrm{O}CH3CHO+3 OH−→CH3COO−+2 e−+2 H2O
C. 2 Cu2++e−+2 OH−→Cu2O+H2O2 \mathrm{~Cu}^{2+}+\mathrm{e}^{-}+2 \mathrm{~OH}^{-} \rightarrow \mathrm{Cu}_{2} \mathrm{O}+\mathrm{H}_{2} \mathrm{O}2 Cu2++e−+2 OH−→Cu2O+H2O
D. CH3CH2OH+2 OH−→CH3CHO+2 e−+2 H2O\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}+2 \mathrm{~OH}^{-} \rightarrow \mathrm{CH}_{3} \mathrm{CHO}+2 \mathrm{~e}^{-}+2 \mathrm{~H}_{2} \mathrm{O}CH3CH2OH+2 OH−→CH3CHO+2 e−+2 H2O
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