Which of the following statements is incorrect? [NEET 2021]

In ETC (Electron Transport Chain), one molecule of \(\mathrm{NADH}+{\mathrm{H}}^{+}\)gives rise to 2 ATP molecules, and one \({\mathrm{FADH}}_{2}\) gives rise to 3 ATP molecules.

ATP is synthesized through complex V.

Oxidation - reduction reactions produce proton gradient in respiration,

During aerobic respiration, role of oxygen is limited to the terminal stage.