Assertion : Alkyl benzene is not prepared by Friedel Craft alkylation of benzene.
Reason : Grignard reagents react with hydroxyl group

Options

A. If the both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true and the reason is not the correct explanation of the assertion
C. If assertion is false but reason is true
D. If both assertion and reason are false statements.

Explanation

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

### Step 1: Analyze the Assertion
The assertion states: "Alkyl benzene is not prepared by Friedel Craft alkylation of benzene."

- Friedel-Crafts alkylation is a well-known reaction where an alkyl group is introduced to an aromatic ring (like benzene) using an alkyl halide and a Lewis acid catalyst (such as AlCl3).
- For example, if we take benzene and react it with ethyl chloride (C2H5Cl) in the presence of anhydrous AlCl3, the ethyl group can successfully be attached to the benzene ring, resulting in ethyl benzene.

**Conclusion for Step 1**: The assertion is **false** because alkyl benzene can indeed be prepared via Friedel-Crafts alkylation.

### Step 2: Analyze the Reason
The reason states: "Grignard reagents react with hydroxyl group."

- Grignard reagents (RMgX) are highly reactive organomagnesium compounds that can react with various functional groups.
- When Grignard reagents encounter alcohols (which contain hydroxyl groups, -OH), they undergo an acid-base reaction. The acidic hydrogen of the hydroxyl group reacts with the Grignard reagent, leading to the formation of an alkoxide and releasing a hydrocarbon (alkane) as a byproduct.

**Conclusion for Step 2**: The reason is **true** because Grignard reagents do indeed react with hydroxyl groups.

### Final Conclusion
- The assertion is **false**.
- The reason is **true**.

Thus, the correct answer to the question is that the assertion is false and the reason is true.

### Answer: C (Assertion is false, Reason is true)

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