Which of the following is an example of aryl alkyl halide ?

Options

A. p - chlorotoluence
B. Chlorobenzene
C. Allyl chloride
D. Benzyl chloride

Answer

To determine which of the given options is an example of an aryl alkyl halide, we need to understand the definitions and structures involved. An aryl alkyl halide is a compound that contains an aryl group (derived from an aromatic compound), an alkyl group (a saturated carbon chain), and a halogen atom (such as Cl, Br, or I).

### Step-by-Step Solution:

1. **Understanding Aryl Alkyl Halide**:
- An aryl alkyl halide consists of:
- An aryl group (e.g., phenyl group).
- An alkyl group (e.g., methyl, ethyl).
- A halogen atom (X = Cl, Br, I).

2. **Analyzing the Options**:
- **Option A: Parachlorotoluene**:
- Structure: CH3-C6H4-Cl (where the Cl is at the para position).
- This compound has an aryl group (C6H4) and a halogen (Cl), but it does not have a separate alkyl group attached to the aryl group. Thus, it is an aryl halide, not an aryl alkyl halide.

- **Option B: Chlorobenzene**:
- Structure: C6H5-Cl.
- This compound consists of a benzene ring with a Cl attached. It is purely an aryl halide and lacks an alkyl group. Therefore, it is not an aryl alkyl halide.

- **Option C: Allyl Fluoride**:
- Structure: CH2=CH-CH2-F.
- This compound has an alkyl group (allyl) and a halogen (F), but it does not contain an aryl group. Thus, it is classified as an alkyl halide, not an aryl alkyl halide.

- **Option D: Benzyl Fluoride**:
- Structure: C6H5-CH2-F.
- This compound has a benzene ring (aryl group), a CH2 group (alkyl group), and a fluorine atom (halogen). This fits the definition of an aryl alkyl halide.

3. **Conclusion**:
- The only compound that fits the definition of an aryl alkyl halide is **Option D: Benzyl Fluoride**.

### Final Answer:
**D: Benzyl Fluoride** is an example of an aryl alkyl halide.