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  4. In all the following reactions, reduction of NAD+ to NADH occurs, except

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Q. In all the following reactions, reduction of NAD+ to NADH occurs, except

NTA AbhyasNTA Abhyas 2022

Solution:

During the step of Krebs' cycle, where succinic acid undergoes oxidation or dehydrogenation to form Fumaric acid, FAD is reduced to FADH2 and enzyme involved in this step is succinic acid dehydrogenase.
Conversion of isocitric acid to $\alpha $ -ketoglutaric acid, malic acid to oxaloacetic acid and pyruvic acid to acetyl Co-A, all involve the reduction of NAD to NADH + H+.