Study the incorrect statement with respect to an overview of the electron transport system (ETS).

Options

A. Ubiquinone receives reducing equivalents via, `FADH_(2)` (complex II) that is generated during oxidation of succinate in the TCA cycle.
B. As the electron move down the system, energy is released and used to form ATP
C. `2ATPs` are formed for every pair of electrons that enters by way of `NADH` and `3ATPs` are formed for every pair of electrons that enters by way of `FADH_(2)`
D. Oxygen, the final `e^(-)` acceptor becomes a part of water.

Explanation

To solve the question regarding the incorrect statement about the electron transport system (ETS), we will analyze each statement provided and determine which one is incorrect.

### Step-by-Step Solution:

1. **Understanding the Electron Transport System (ETS)**:
- The ETS is a series of protein complexes and other molecules that transfer electrons from electron donors (like NADH and FADH2) to electron acceptors (like oxygen), ultimately producing ATP.

2. **Analyzing Statement 1**:
- **Statement**: "Ubiquinone receives reducing equivalent via FADH2 complex that is generated during oxidation of succinate in the TCA cycle."
- **Analysis**: This statement is correct. Ubiquinone (also known as coenzyme Q) does receive electrons from FADH2, which is produced during the oxidation of succinate in the TCA cycle.

3. **Analyzing Statement 2**:
- **Statement**: "As the electron moves down the system, energy is released and used to form ATP."
- **Analysis**: This statement is also correct. As electrons move through the ETS, energy is released, which is used to pump protons across the mitochondrial membrane, creating a proton gradient that drives ATP synthesis.

4. **Analyzing Statement 3**:
- **Statement**: "Two ATPs are formed for every pair of electrons that enter by the way of NADH and 3 ATP are formed for every pair of electron that enter by the way FADH2."
- **Analysis**: This statement is incorrect. The correct information is that 3 ATP are produced for every pair of electrons that enter via NADH, and 2 ATP are produced for every pair of electrons that enter via FADH2.

5. **Analyzing Statement 4**:
- **Statement**: "Oxygen is the final electron acceptor and becomes a part of water."
- **Analysis**: This statement is correct. Oxygen acts as the final electron acceptor in the ETS and combines with electrons and protons to form water.

6. **Conclusion**:
- The incorrect statement is Statement 3. Therefore, the answer to the question is that Statement 3 is the incorrect statement with respect to the overview of the electron transport system.

### Final Answer:
The incorrect statement is: "Two ATPs are formed for every pair of electrons that enter by the way of NADH and 3 ATP are formed for every pair of electron that enter by the way FADH2."

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