All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is
lactate dehydrogenase
isocitrate dehydrogenase
malate dehydrogenase
succinate dehydrogenase
Succinate dehydrogenase enzyme is present on the inner membrane of mitochondria and catalyzes the oxidation of succinate to fumarate.Hence, the correct answer is option 4.