When alkyl halides reaction with aromatic compounds in presence of anhydrous `AlCl_3` , the reaction is known as

Options

A. Friedal - Craff reaction
B. Hofmann degradation
C. Kolbe's synthesis
D. Beckmann rearrangement

Answer

To solve the question regarding the reaction of alkyl halides with aromatic compounds in the presence of anhydrous AlCl3, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reaction Type**:
- The reaction involves alkyl halides (e.g., chloromethane) and aromatic compounds (e.g., benzene).
- The presence of anhydrous AlCl3 indicates that we are dealing with a Friedel-Crafts reaction.

2. **Understand Friedel-Crafts Reactions**:
- Friedel-Crafts reactions are a type of electrophilic aromatic substitution. They include two main types: alkylation and acylation.
- In this case, we are focusing on alkylation, where an alkyl group is introduced into the aromatic ring.

3. **Write the General Reaction**:
- The general form of the reaction can be represented as:
\[ \text{C}_6\text{H}_6 + \text{R-X} \xrightarrow{\text{AlCl}_3} \text{C}_6\text{H}_5\text{R} + \text{HX} \]
- Here, R-X represents the alkyl halide (e.g., CH3Cl), and HX is the hydrogen halide produced.

4. **Example Reaction**:
- For example, when benzene (C6H6) reacts with chloromethane (CH3Cl) in the presence of anhydrous AlCl3, the reaction can be written as:
\[ \text{C}_6\text{H}_6 + \text{CH}_3\text{Cl} \xrightarrow{\text{AlCl}_3} \text{C}_6\text{H}_5\text{CH}_3 + \text{HCl} \]
- The product here is toluene (C6H5CH3).

5. **Conclusion**:
- Therefore, the reaction of alkyl halides with aromatic compounds in the presence of anhydrous AlCl3 is known as the Friedel-Crafts alkylation reaction.

### Final Answer:
The reaction is known as **Friedel-Crafts reaction**.