In which one of the following steps of citric acid cycle, FAD is reduced to $FADH_2$

Pyruvate Acetyl CoA

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Succinic acid Malic acid

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Malic acid Oxalosuccinic acid

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Citric acid -Ketoglutaric acid

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-Ketoglutasic Succinic acid

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Solution

The correct option is B Succinic acid Malic acid
During the process of citric acid cycle, FAD is reduced to FADH2 when succinic acid is oxidised to malic acid in presence of succinic dehydrogenase. Fumaric acid is formed as an intermediate.
So the answer is 'Succinic acid Malic acid'.

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