In TCA cycle, when succinate is converted to fumarate

Hydrogen is liberated.

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Oxygen is added.

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Proton is removed.

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Electron is added.

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Solution

The correct option is C Proton is removed.
Succinate and fumarate are the intermediates of TCA cycle. When succinate is converted to fumarate, 2 protons are removed which are taken by FAD and convert into FADH $_{2}$ . This reaction is catalysed by succinate dehydrogenase.

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