Reduction of $NAD^+$ does not occur in the reaction

Pyruvic acid Acetyl CoA

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Isocitric acid -ketoglutaric acid

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Malic acid Oxaloacetic acid

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Succinic acid Fumaric Acid

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Solution

The correct option is D Succinic acid Fumaric Acid
Krebs' cycle is a cyclic process that occurs in mitochondrial matrix in which reduced compounds like NADH2 and FADH2 are formed that liberate energy as ATP as they undergo ETS. The conversion of succinic acid to fumaric acid reduces FAD to FADH2 and not NAD to NADH2.
So the answer is 'Succinic acid to Fumaric acid'.

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N A D^{+}

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\to

C O_{2}

\begin{matrix} I . C i t r i c a c i d & \to & α - k e t o g l u t a r i c a c i d I I . S u c c i n i c a c i d & \to & M a l i c a c i d I I I . M a l i c a c i d & \to & O x a l o a c e t i c a c i d I V . α - k e t o g l u t a r i c a c i d & \to & S u c c i n y l C o - A \end{matrix}

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