Which of the following compounds show stereoisomers?
a. 2-Bromo spiro `[4.5]` decane
b. 8-Chloro spiro `[4.5]` decane

Explanation

To determine which of the given compounds show stereoisomerism, we will analyze the structures of both compounds: 2-Bromo spiro [4.5] decane and 8-Chloro spiro [4.5] decane.

### Step-by-Step Solution:

1. **Understanding Stereoisomerism**:
- Stereoisomers are compounds that have the same molecular formula and connectivity of atoms but differ in the spatial arrangement of atoms. For a compound to exhibit stereoisomerism, it must have at least one chiral center (a carbon atom bonded to four different groups) or a lack of symmetry (no plane of symmetry).

2. **Analyzing 2-Bromo spiro [4.5] decane**:
...