Complex which transfers electrons of `FADH_(2)` to ETS is

Options

A. I
B. II
C. III
D. IV

Answer

To answer the question about which complex transfers electrons from FADH₂ to the electron transport system (ETS), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Electron Transport Chain (ETS)**:
- The electron transport chain is a series of protein complexes located in the inner mitochondrial membrane. It is responsible for transferring electrons derived from NADH and FADH₂ to ultimately produce ATP.

2. **Identifying the Complexes**:
- There are four main complexes in the ETS: Complex I, Complex II, Complex III, and Complex IV. Each complex plays a specific role in the electron transfer process.

3. **Role of FADH₂**:
- FADH₂ is a product of the Krebs cycle and donates electrons to the ETS. It is important to note that FADH₂ enters the ETS at a different point compared to NADH.

4. **Complex II**:
- Complex II, also known as succinate dehydrogenase, is specifically responsible for receiving electrons from FADH₂. When FADH₂ donates its electrons to Complex II, it is converted back to FAD.

5. **Electron Transfer Process**:
- After FADH₂ donates its electrons to Complex II, the electrons are then passed on to Complex III and subsequently to Complex IV, where they ultimately reduce oxygen to form water.

6. **Conclusion**:
- Therefore, the complex that transfers electrons from FADH₂ to the electron transport system is **Complex II**.

### Final Answer:
The complex which transfers electrons of FADH₂ to the electron transport system is **Complex II**.

---