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 three given conformations of n-butane and check for chirality. A chiral molecule is one that cannot be superimposed on its mirror image, meaning it lacks an internal plane of symmetry.

### Step-by-Step Solution:

1. **Understanding Chirality**:
- A chiral molecule has a non-superimposable mirror image. This means that if you were to draw a mirror image of the molecule, you would not be able to align the two perfectly.

2. **Identifying Conformations**:
- We have three conformations of n-butane to analyze. These are typically represented using Newman projections.

3. **Analyzing Conformation A**:
- In the first conformation, if we draw a plane of symmetry, we can see that it bisects the molecule into two identical halves. This indicates that it has an internal plane of symmetry and is therefore **achiral**.

4. **Analyzing Conformation B**:
- In the second conformation, a similar analysis shows that a plane of symmetry can also be drawn, which divides the molecule into two mirror-image halves. Thus, this conformation is also **achiral**.

5. **Analyzing Conformation C**:
- In the third conformation, when we attempt to draw a plane of symmetry, we find that it does not bisect the molecule into two identical halves. The groups attached to the front and back carbons are different (for instance, one side may have a CH3 group while the other has a hydrogen atom). This lack of symmetry indicates that this conformation is **chiral**.

6. **Conclusion**:
- Based on the analysis, the chiral conformation of n-butane is found in option C. Therefore, the correct answer is option C.

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