Q. In which of the following, reduction of NAD does not occur?
A) Isocitric acid$\rightarrow \alpha$-ketoglutaric acid
B) Malic acid $\rightarrow$Oxaloacetic acid
C) Pyruvic acid $\rightarrow$Acetyl coenzyme
D) Succinic acid $\rightarrow$Fumaric acid
Explanation
During the step of Krebs’ cycle, where Succinic acid undergoes oxidation or dehydrogenation to form Fumaric acid, FAD is reduced to FAD$H_{2}$ 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 reduction of NAD to NADH+$H^{+}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.