Which of the following catalyst is used for preparing toluene by reacting benzene with methyl chloride ? 

Options

A. Ni
B. Anhydrous `AICI_(3)`
C. Pd
D. Pt

Answer

To solve the question about which catalyst is used for preparing toluene by reacting benzene with methyl chloride, we can follow these steps:

### Step 1: Understand the Reaction
The reaction in question is known as Friedel-Crafts alkylation. This is a method used to introduce an alkyl group into an aromatic ring.

### Step 2: Identify the Reactants
In this case, the reactants are benzene (C6H6) and methyl chloride (CH3Cl).

### Step 3: Identify the Catalyst
For Friedel-Crafts alkylation, a Lewis acid catalyst is typically used. The most common catalyst for this reaction is anhydrous aluminium chloride (AlCl3).

### Step 4: Write the Reaction
The reaction can be summarized as follows:
- Benzene + Methyl Chloride (in the presence of AlCl3) → Toluene (C7H8) + HCl

### Step 5: Conclusion
From the above steps, we conclude that the catalyst used for preparing toluene from benzene and methyl chloride is anhydrous aluminium chloride (AlCl3).

### Final Answer
The catalyst used is **Anhydrous Aluminium Chloride (AlCl3)**.

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