Which of the following is/are chiral?

Options

A.
B.
C.
D.

Answer

To determine which of the given compounds are chiral, we need to analyze each option based on the concept of chirality. A chiral compound is one that cannot be superimposed on its mirror image, typically due to the presence of a chiral center (usually a carbon atom bonded to four different substituents).

### Step-by-Step Solution:

1. **Analyze Option A:**
- The structure is represented as Cl and Br at both ends.
- When we draw a plane through the molecule, it divides the compound into two equal halves.
- Since the molecule can be superimposed on its mirror image, it is **not chiral**.

2. **Analyze Option B:**
- The structure has a double bond with Cl and Br on both sides.
- Similar to Option A, if we draw a plane through the double bond, it divides the molecule into two equal halves.
- This indicates that the molecule can also be superimposed on its mirror image, hence it is **not chiral**.

3. **Analyze Option C:**
- The structure is similar to the previous options.
- Drawing a plane through the molecule again shows that it can be divided into two equal halves.
- Therefore, it is also **not chiral**.

4. **Analyze Option D:**
- The structure is represented as Br, H, H, and Br.
- In this case, one bromine is out of the plane while one hydrogen is inside the plane.
- No plane can divide this molecule into two equal halves, which means it cannot be superimposed on its mirror image.
- Thus, this compound is **chiral**.

### Conclusion:
- The only chiral compound among the options is **Option D**.