ANSWER  

e.succinic acid->fumaric acid--------4ATP(2X2) 

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DURING GLYCOLYSIS, GLUCOSE IS CONVERTED INTO PYRUVIC ACID,

Glucose (C₆H₁₂O₆) + hexokinase + ATP → ADP + Glucose 6-phosphate (C₆H₁₁O₆P₁)
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Glucose 6-phosphate (C₆H₁₁O₆P₁) + Phosphoglucoisomerase → Fructose 6-phosphate (C₆H₁₁O₆P₁)

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Fructose 6-phosphate (C₆H₁₁O₆P₁) + phosphofructokinase + ATP → ADP + Fructose 1, 6-diphosphate (C₆H₁₀O₆P₂)

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Fructose 1, 6-diphosphate (C₆H₁₀O₆P₂) + aldolase → Dihydroxyacetone phosphate (C₃H₅O₃P₁) + Glyceraldehyde phosphate (C₃H₅O₃P₁)

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Dihydroxyacetone phosphate (C₃H₅O₃P₁) → Glyceraldehyde phosphate (C₃H₅O₃P₁)

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Fructose 1, 6-diphosphate (C₆H₁₀O₆P₂) ↔ 2 molecules of Glyceraldehyde phosphate (C₃H₅O₃P₁)

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A. Triose phosphate dehydrogenase + 2 H^- + 2 NAD⁺ → 2 NADH + 2 H⁺

B. Triose phosphate dehydrogenase + 2 P + 2 glyceraldehyde phosphate (C₃H₅O₃P₁) → 2 molecules of 1,3-diphoshoglyceric acid (C₃H₄O₄P₂)
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2 molecules of 1,3-diphoshoglyceric acid (C₃H₄O₄P₂) + phosphoglycerokinase + 2 ADP → 2 molecules of 3-phosphoglyceric acid (C₃H₅O₄P₁) + 2 ATP

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2 molecules of 3-Phosphoglyceric acid (C₃H₅O₄P₁) + phosphoglyceromutase → 2 molecules of 2-Phosphoglyceric acid (C₃H₅O₄P₁)

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 2 molecules of 2-Phosphoglyceric acid (C₃H₅O₄P₁) + enolase → 2 molecules of phosphoenolpyruvic acid (PEP) (C₃H₃O₃P₁)

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2 molecules of PEP (C₃H₃O₃P₁) + pyruvate kinase + 2 ADP → 2 molecules of pyruvic acid (C₃H₄O₃) + 2 ATP

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IN KREBS CYCLE

Succinate is a component of the citric acid cucle and is capable of donating electrons to the electron transfer chain via the following reaction:

Succinic acid to fumaric acid yields a reduced flavoprotein. This FADH2 can be passed to FPH2 and used in the electron transport chain (in the presence of oxygen) to presumably yield two ATP molecules.  ----------------------------------------------------------

STAGE III OF KREB CYCLE

2acetyl CO A + 6H₂O +2ADP+2P ---->4CO+2 ATP+16H+2COA