Chlorobenzene on reaction with `CH_3Cl` in presence of `AlCl_3` gives

Options

A. toluene
B. m - chloro toluene
C. only o - chloro toluene
D. mixture of o - and p - chlorotoulene

Explanation

To solve the problem of what product is formed when chlorobenzene reacts with methyl chloride (CH₃Cl) in the presence of aluminum chloride (AlCl₃), we can follow these steps:

### Step 1: Identify the Reactants
We start with two reactants:
- Chlorobenzene (C₆H₅Cl)
- Methyl chloride (CH₃Cl)
- Aluminum chloride (AlCl₃) as a catalyst

### Step 2: Understand the Reaction Type
The reaction between chlorobenzene and methyl chloride in the presence of AlCl₃ is an electrophilic aromatic substitution reaction. In this reaction, the methyl group from methyl chloride will substitute one of the hydrogen atoms on the benzene ring of chlorobenzene.

### Step 3: Formation of Electrophile
Aluminum chloride (AlCl₃) acts as a Lewis acid and helps generate the electrophile. When CH₃Cl reacts with AlCl₃, it forms a methyl cation (CH₃⁺) and AlCl₄⁻:
- CH₃Cl + AlCl₃ → CH₃⁺ + AlCl₄⁻

### Step 4: Electrophilic Attack
The generated methyl cation (CH₃⁺) is a strong electrophile. Chlorobenzene, being an aromatic compound, has electron-rich sites at the ortho and para positions due to the presence of the chlorine atom, which is an ortho-para directing group. The methyl cation will attack the benzene ring at these positions.

### Step 5: Possible Products
The electrophilic attack can occur at two positions:
1. **Ortho position**: This leads to the formation of ortho-chlorotoluene.
2. **Para position**: This leads to the formation of para-chlorotoluene.

### Step 6: Major and Minor Products
In this reaction, the ortho product (ortho-chlorotoluene) is typically formed in smaller amounts compared to the para product (para-chlorotoluene) due to steric hindrance. Therefore, the major product is para-chlorotoluene, and the minor product is ortho-chlorotoluene.

### Final Products
Thus, the products formed from the reaction of chlorobenzene with methyl chloride in the presence of aluminum chloride are:
- **Major Product**: Para-chlorotoluene
- **Minor Product**: Ortho-chlorotoluene

### Summary
The reaction can be summarized as follows:
Chlorobenzene + CH₃Cl (in presence of AlCl₃) → Para-chlorotoluene (major) + Ortho-chlorotoluene (minor)

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