Which conformation of Bicyclo [2, 2, 2]-octane is more stable?

Options

A. Chair
B. Half Boat
C. Boat
D. Twisted boat

Explanation

To determine which conformation of Bicyclo[2,2,2]-octane is more stable, we need to analyze the different conformations of the molecule and evaluate their stability based on steric hindrance and van der Waals strain.

### Step-by-Step Solution:

1. **Understanding Bicyclo[2,2,2]-octane**:
- Bicyclo[2,2,2]-octane consists of a bicyclic structure with two carbon atoms in each of the three bridges. The structure can adopt different conformations, primarily the boat and chair forms.

2. **Identifying Conformations**:
- The two main conformations we will consider are the boat-shaped conformation and other possible conformations (like chair or twist forms).

3. **Evaluating Stability**:
- **Steric Hindrance**: This refers to the repulsion between atoms that are too close to each other. In the boat conformation, the arrangement of atoms minimizes steric hindrance compared to other conformations.
- **Van der Waals Strain**: This strain arises from the interactions between non-bonded atoms that are in close proximity. The boat conformation also tends to have less van der Waals strain due to its spatial arrangement.

4. **Conclusion**:
- Based on the analysis of steric hindrance and van der Waals strain, the boat-shaped conformation of Bicyclo[2,2,2]-octane is more stable than other conformations. Therefore, the correct answer is that the boat-shaped conformation is the most stable.

### Final Answer:
The more stable conformation of Bicyclo[2,2,2]-octane is the **boat-shaped conformation**.

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