Assertion : In the reaction, `(1)/(2)O_(2)+F_(2)rarrOF_(2)` Fluorine is oxidant.
Reason :- Fluorine cannot show positive oxidation state.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are False.

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that in the reaction \( \frac{1}{2} O_2 + F_2 \rightarrow OF_2 \), fluorine acts as an oxidant.

- In this reaction, oxygen (O) is reacting with fluorine (F) to form oxygen difluoride (OF2).
- To determine whether fluorine is an oxidant, we need to look at the oxidation states of the elements involved.

### Step 2: Determine Oxidation States
In the compound OF2:
- Oxygen typically has an oxidation state of -2.
- Fluorine, being the most electronegative element, has an oxidation state of -1 in OF2.

Thus, in the reaction:
- The oxidation state of O in \( O_2 \) is 0 (elemental form).
- The oxidation state of F in \( F_2 \) is also 0 (elemental form).

### Step 3: Identify Changes in Oxidation States
- Oxygen goes from 0 in \( O_2 \) to +2 in \( OF_2 \).
- Fluorine goes from 0 in \( F_2 \) to -1 in \( OF_2 \).

This indicates that:
- Oxygen is being oxidized (its oxidation state increases).
- Fluorine is being reduced (its oxidation state decreases).

Since fluorine causes the oxidation of oxygen, it acts as an oxidizing agent (or oxidant).

### Step 4: Analyze the Reason
The reason states that fluorine cannot show a positive oxidation state.

- This statement is true. Fluorine is the most electronegative element and typically exhibits a -1 oxidation state in compounds.
- However, this fact does not explain why fluorine is an oxidant in the given reaction.

### Conclusion
- The assertion is correct: Fluorine is indeed an oxidant in the reaction.
- The reason is also correct: Fluorine cannot show a positive oxidation state.
- However, the reason does not correctly explain the assertion.

Thus, the answer is:
**Option B: Both assertion and reason are correct, but the reason is not the correct explanation of the assertion.**