Match List I with List II List I List II A Pyruvic acid Acetyl CoA I Substrate-level phosphorylation B -ketoglutaric acid Succinyl-CoA II Generation of FADH₂ C Succinyl-CoA Succinic acid III Link reaction catalyzed by Pyruvate dehydrogenase D Succinic acid Malic acid IV Decarboxylation step producing a 4-carbon compound Choose the correct answer from the options given below:

Step-by-step solution

The conversion of Pyruvic acid to Acetyl CoA is the link reaction connecting glycolysis and the Krebs cycle, catalyzed by the enzyme Pyruvate dehydrogenase. Thus, A matches III. The conversion of -ketoglutaric acid (a 5-carbon compound) to Succinyl-CoA (a 4-carbon compound) involves oxidative decarboxylation, releasing CO₂ . Thus, B matches IV. The conversion of Succinyl-CoA to Succinic acid is coupled with the synthesis of GTP (or ATP) from GDP (or ADP) and inorganic phosphate. This is an example of substrate-leve