In the oxidation of succinate to fumarate in the citric acid cycle, the coenzyme is

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The coenzyme in the oxidation of succinate to fumarate in the citric acid cycle is FAD (flavin adenine dinucleotide), which accepts two electrons and two protons from succinate to form FADH2. This FADH2 will then donate its electrons and protons to the electron transport chain for ATP production. Neither CoA nor acetyl CoA is involved in this step of the cycle. NADH is involved in the previous step of the cycle (oxidation of isocitrate to alpha-ketoglutarate). The image provided is not relevant to the question.

In the Oxidation of Succinate to Fumarate in the Citric