Which of the following conformation of n - butane is chiral ?

Options

A.
B.
C.
D. All of these

Answer

To determine which conformation of n-butane is chiral, we need to analyze the different conformations of n-butane and check for chirality. A molecule is chiral if it does not have a plane of symmetry and its mirror images are not superimposable.

### Step-by-Step Solution:

1. **Understanding Chirality**:
- A molecule is chiral if it has no plane of symmetry and its mirror image cannot be superimposed onto itself.

2. **Identifying Conformations of n-Butane**:
- n-Butane has several conformations, including the anti, gauche, eclipsed, and staggered forms. We will analyze these conformations to see if any are chiral.

3. **Analyzing Conformation A**:
- In the first conformation, if we draw a plane of symmetry, we can see that the molecule can be divided into two equal halves with mirror images. Therefore, this conformation is achiral.

4. **Analyzing Conformation B**:
- In the second conformation, similar to the first, a plane of symmetry can be drawn. This means that the molecule is also achiral.

5. **Analyzing Conformation C**:
- In the third conformation, if we draw a plane of symmetry, we find that the front carbon can be divided into two equal parts, but the back carbon has different groups (CH3 and H). This means that the mirror images are not superimposable. Therefore, this conformation is chiral.

6. **Analyzing Conformation D**:
- The fourth conformation also has a plane of symmetry, making it achiral.

7. **Conclusion**:
- Only Conformation C of n-butane is chiral because it lacks a plane of symmetry and its mirror images are non-superimposable.

### Final Answer:
The chiral conformation of n-butane is **Conformation C**.