Which of the following is a secondary alkyl halide ?

Options

A. Isobutyl chloride
B. Isopentyl chloride
C. Neopently Chloride
D. Isopropyl chloride

Answer

To determine which of the given compounds is a secondary alkyl halide, we will analyze each option by drawing its structure and identifying the degree of the carbon atom to which the halogen is attached.

### Step-by-Step Solution:

1. **Identify the Compounds:**
We have four options to analyze:
- Isobutyl chloride
- Isopentyl chloride
- Neopentyl chloride
- Isopropyl chloride

2. **Draw the Structure of Isobutyl Chloride:**
The structure of isobutyl chloride can be represented as:
\[ \text{CH}_3-\text{CH}(\text{Cl})-\text{CH}_2-\text{CH}_3 \]
Here, the carbon with the chlorine (Cl) is attached to only one other carbon, making it a primary alkyl halide.

3. **Draw the Structure of Isopentyl Chloride:**
The structure of isopentyl chloride is:
\[ \text{CH}_3-\text{CH}(\text{Cl})-\text{CH}_2-\text{CH}_3 \]
Similar to isobutyl chloride, the carbon with the chlorine is also attached to only one other carbon, indicating that it is a primary alkyl halide.

4. **Draw the Structure of Neopentyl Chloride:**
The structure of neopentyl chloride can be drawn as:
\[ \text{C}(\text{CH}_3)_4-\text{CH}_2-\text{Cl} \]
In this case, the carbon with the chlorine is attached to only one other carbon, which again makes it a primary alkyl halide.

5. **Draw the Structure of Isopropyl Chloride:**
The structure of isopropyl chloride is:
\[ \text{CH}_3-\text{C}(\text{Cl})(\text{CH}_3)-\text{H} \]
Here, the carbon with the chlorine is attached to two other carbon atoms, indicating that it is a secondary alkyl halide.

6. **Conclusion:**
After analyzing all four options:
- Isobutyl chloride: Primary alkyl halide
- Isopentyl chloride: Primary alkyl halide
- Neopentyl chloride: Primary alkyl halide
- Isopropyl chloride: Secondary alkyl halide

Therefore, the correct answer is **Isopropyl chloride**, which is the only secondary alkyl halide among the options provided.