Which of the following alkyl halides is iso -butyl bromide ?

Options

A. `CH_(3)CH_(2)underset(Br)underset(|)CHCH_(3)`
B. `CH_(3)CH_(2)CH_(2)CH_(2)Br`
C. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-Br`
D. `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)Br`

Answer

To determine which alkyl halide is iso-butyl bromide, we need to understand the structure of iso-butyl bromide and then compare it with the given options.

### Step-by-Step Solution:

1. **Understanding Iso-butyl Bromide**:
- Iso-butyl bromide is an alkyl halide with the formula C4H9Br.
- The "iso" prefix indicates that the structure has a branched configuration. Specifically, iso-butyl refers to a butyl group where one of the carbons is branched.

2. **Drawing the Structure**:
- The structure of iso-butyl bromide can be represented as follows:
- It has a total of 4 carbon atoms (C4).
- The structure can be depicted as:
```
CH3
|
CH3-CH-CH2-Br
```
- In this structure, the bromine (Br) is attached to the terminal carbon of the branched chain.

3. **Identifying the Correct Option**:
- Now, we need to compare the drawn structure with the given options in the question.
- Look for the option that matches the branched structure of iso-butyl bromide.

4. **Conclusion**:
- After analyzing the options, the correct alkyl halide that corresponds to iso-butyl bromide is **Option D**.

### Final Answer:
The alkyl halide that is iso-butyl bromide is **Option D**.