Which of the following compound react with `BF_(3)`?

Options

A. Ethers
B. `H_(2)O`
C. Ethylalcohol
D. `NH_(3)`

Answer

To determine which of the given compounds react with BF3, we need to analyze the nature of BF3 and the compounds listed.

### Step-by-Step Solution:

1. **Understanding BF3**:
- BF3 (Boron trifluoride) is a well-known Lewis acid. This means it can accept a pair of electrons to form a bond. It has an empty p-orbital that allows it to accept electron pairs from Lewis bases.

2. **Identifying Lewis Bases**:
- A Lewis base is a substance that can donate a pair of electrons. We need to evaluate the given compounds to see which one can act as a Lewis base.

3. **Evaluating the Compounds**:
- **Ethers**: Ethers typically do not have a strong tendency to donate electron pairs compared to other compounds. They are generally neutral and do not react with Lewis acids like BF3.
- **Water (H2O)**: Water can act as a weak Lewis base due to the presence of lone pairs on the oxygen atom. However, it is not as strong a Lewis base as others.
- **Ethyl Alcohol (C2H5OH)**: Ethyl alcohol has a hydroxyl group (-OH) and can donate a lone pair from the oxygen, but it is also a weak Lewis base.
- **Ammonia (NH3)**: Ammonia is a strong Lewis base because it has a lone pair of electrons on the nitrogen atom that it can readily donate.

4. **Conclusion**:
- Among the given options, NH3 is the strongest Lewis base and will react with BF3. The reaction occurs because NH3 can donate its lone pair to the empty p-orbital of BF3, forming a coordinate bond.

### Final Answer:
- The compound that reacts with BF3 is **NH3 (Ammonia)**.