Which of the following is the final acceptor of electron in respiratory chain?

Explanation

The final electron acceptor in the respiratory chain is oxygen (O2). During oxidative phosphorylation, electrons are passed along a series of membrane-bound protein complexes, which pump protons (H+) across the inner mitochondrial membrane, creating an electrochemical gradient. At the end of the electron transport chain, the electrons are transferred to oxygen molecules, which combine with protons to form water (H2O). This process generates a large amount of energy, which is used to synthesize ATP from ADP and inorganic phosphate.