Butan-1-ol and 2-methylpropan-1-ol differ in their ......skeletons and show ......... isomerism.

Explanation

To solve the question, we need to analyze the structures of Butan-1-ol and 2-methylpropan-1-ol, identify their differences, and determine the type of isomerism they exhibit.

### Step-by-Step Solution:

1. **Identify the Structures**:
- **Butan-1-ol**: This compound has a straight-chain structure with four carbon atoms and an -OH (hydroxyl) group attached to the first carbon. Its structure can be represented as:
```
CH3-CH2-CH2-CH2-OH
...