The property which is not true about fluorine is

Options

A. Most of its reactions are exothermic
B. It forms only one oxo acid
C. Highest electronegativity
D. High F–F bond dissociation enthalpy

Explanation

To answer the question regarding the property that is not true about fluorine, we will analyze the common properties of fluorine and identify any misconceptions or inaccuracies.

### Step-by-Step Solution:

1. **Identify Common Properties of Fluorine**:
- Fluorine is a pale yellow gas at room temperature.
- It is the most electronegative element.
- Fluorine is highly reactive and forms compounds with almost all elements.
- It exists as a diatomic molecule (F₂) in its natural state.

2. **Evaluate the Properties**:
- Check if the property in question aligns with the known characteristics of fluorine.
- For example, if the property states that fluorine is a stable element under standard conditions, this would be false since fluorine is highly reactive.

3. **Identify Misconceptions**:
- Some common misconceptions might include:
- Fluorine is not a solid at room temperature (it is a gas).
- Fluorine does not have a higher boiling point than chlorine (it has a lower boiling point).
- Fluorine does not exist in a monatomic form under normal conditions (it is diatomic).

4. **Conclusion**:
- Based on the evaluation, identify the property that is not true about fluorine. For example, if the statement is "Fluorine is a stable element," this would be the incorrect property.

### Final Answer:
The property which is not true about fluorine is that it is a stable element under standard conditions.