All reactions in TCA cycle are reversible except the formation of

All reactions in TCA cycle are reversible except the formation of Succinyl Co-A.
The citric acid cycle (CAC) or the TCA cycle (tricarboxylic acid cycle)is a series of chemical reactions to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.
Succinyl Co-A is irreversible stage, it generates NADH, and regenerates the 4C chain.