Which equation does not represent an example of Friedal-crafts reaction?

Options

A. `C_(6)H_(6)+C_(2)H_(5)Clunderset(("Anhy"))overset(AlCl_(3))rarrC_(6)H_(5)C_(2)H_(5)+HCl`
B. `C_(2)H_(5)OH+HCl overset(ZnCl_(2))rarrC_(2)H_(5)Cl+H_(2)O`
C. `C_(6)H_(6)+CHCl_(3)underset(("Anhy"))overset(AlCl_(3))rarr(C_(6)H_(5))_(3)CH`
D. `C_(6)H_(6)+CH_(3)CH_(2)COClunderset(AlCl_(3))overset("Anhy")rarr`

Answer

To determine which equation does not represent an example of Friedel-Crafts reaction, we first need to understand what Friedel-Crafts reactions are and how they work.

### Step-by-Step Solution:

1. **Understand Friedel-Crafts Reactions**:
- Friedel-Crafts reactions are electrophilic aromatic substitution reactions. They can be categorized into two types: alkylation and acylation.
- **Alkylation** involves the replacement of an aromatic proton with an alkyl group.
- **Acylation** involves the replacement of an aromatic proton with an acyl group.

2. **Identify the Role of Lewis Acids**:
- In both types of reactions, a Lewis acid (commonly anhydrous AlCl3) is used to generate an electrophile from an alkyl or acyl halide.

3. **Analyze Given Options**:
- We need to evaluate the provided equations (or options) to see which one does not fit the Friedel-Crafts reaction criteria.
- The options typically include reactions involving benzene derivatives reacting with alkyl or acyl halides.

4. **Evaluate Each Option**:
- **Option 1**: Involves an alkyl chloride reacting with benzene in the presence of AlCl3. This is a Friedel-Crafts alkylation.
- **Option 2**: Involves ethanol (C2H5OH) reacting with HCl in the presence of Zinc Chloride. This reaction is not a Friedel-Crafts reaction; it is related to the Lucas test for alcohols.
- **Option 3**: Involves an acyl chloride reacting with benzene in the presence of AlCl3. This is a Friedel-Crafts acylation.
- **Option 4**: Similar to Option 3, it involves an acyl chloride and is also a Friedel-Crafts acylation.

5. **Conclusion**:
- After evaluating all options, we find that **Option 2** (C2H5OH + HCl with ZnCl2) does not represent a Friedel-Crafts reaction. It is a different type of reaction used for testing alcohols.

### Final Answer:
The equation that does not represent an example of Friedel-Crafts reaction is **Option 2**: C2H5OH + HCl (with ZnCl2).