According to Neil Bartlett, the first ionisation enthalpy of `O_2` was similar to that of which noble gas element?

Options

A. Xe
B. He
C. kr
D. Ne

Explanation

To solve the question regarding the similarity of the first ionization enthalpy of \( O_2 \) to that of a noble gas element according to Neil Bartlett, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ionization Enthalpy**:
- Ionization enthalpy is the amount of energy required to remove an electron from a gaseous atom or molecule. For \( O_2 \), we are looking at the energy needed to remove an electron from the oxygen molecule.

2. **Neil Bartlett's Contribution**:
- Neil Bartlett was a chemist known for his work with noble gases. He notably prepared a compound involving xenon and platinum fluoride, which led to significant findings about noble gases and their reactivity.

3. **Comparison of Ionization Energies**:
- Bartlett observed that the first ionization enthalpy of \( O_2 \) was similar to that of xenon (\( Xe \)). This was a groundbreaking observation because it suggested that \( O_2 \) could form compounds in a manner similar to noble gases, which were previously thought to be inert.

4. **Conclusion**:
- Based on Bartlett's findings, we conclude that the first ionization enthalpy of \( O_2 \) is similar to that of xenon (\( Xe \)). Thus, the answer to the question is that \( O_2 \) has a first ionization enthalpy similar to that of xenon.

### Final Answer:
The first ionization enthalpy of \( O_2 \) is similar to that of xenon (\( Xe \)).

---