In Which of the Following Reactions is Reduction Taking Place

Question

In which of the following reactions is reduction taking place? A) NAD⁺ → NADH B) FADH → FAD⁺ C) NADH → NAD⁺

Accepted Answer

Reduction involves the gain of electrons. In the reaction NAD⁺ → NADH, NAD⁺ gains electrons (and a hydrogen ion), thus it is reduced to NADH.