Write a reaction representing oxidation of NADH coenzyme.

• A. NADH₂ + CoQ → NAD⁺ + CoQH₂
• B. NADH+ H⁺ + Cyt c → NAD⁺ + Cyt cH₂
• C. NADH + H⁺ + CoQ → NAD⁺ + CoQH₂
• D. NAD⁺ + H → NADH + CoQ

Answer: (C)

Verified step by step guidance

1. Identify the reactants and products in the oxidation of NADH. The reactants are NADH and H+, and the products are NAD+ and CoQH2.
2. Understand that oxidation involves the loss of electrons. In this reaction, NADH is oxidized to NAD+.
3. Recognize that CoQ (coenzyme Q) is reduced to CoQH2 as it gains electrons from NADH.
4. Write the balanced chemical equation for the reaction: NADH + H+ + CoQ → NAD+ + CoQH2.
5. Ensure that the equation is balanced in terms of both mass and charge, confirming that the number of atoms and the charge are the same on both sides of the equation.