Which is not oxidized by `MnO_2`

Options

A. F
B. Cl
C. `I_(2)`
D. l

Explanation

To determine which element is not oxidized by MnO₂, we need to analyze the properties of the halogens, particularly focusing on their reactivity and oxidation states.

### Step-by-Step Solution:

1. **Identify the Elements in Question**:
- The halogens include fluorine (F), chlorine (Cl), bromine (Br), and iodine (I). We are particularly interested in the first three (F, Cl, Br) for this question.

2. **Understand the Oxidizing Agent**:
- Manganese dioxide (MnO₂) is known to act as an oxidizing agent. Oxidizing agents can accept electrons from other substances, thereby oxidizing them.

3. **Analyze the Reactivity of Halogens**:
- Among the halogens, fluorine is the most electronegative and the strongest oxidizing agent. This means that fluorine has a strong tendency to gain electrons and oxidize other substances.

4. **Consider the Oxidation Behavior**:
- Since fluorine is the strongest oxidizing agent, it does not get oxidized by other substances, including MnO₂. Instead, it can oxidize other elements.

5. **Conclusion**:
- Therefore, the element that is not oxidized by MnO₂ is **fluorine (F)**, because it is the strongest oxidizing agent and does not undergo oxidation itself.

### Final Answer:
Fluorine (F) is not oxidized by MnO₂.