What type of isomerism is shown by the following pairs of compounds ? (i) Butan-1-ol and Butan-2-ol (ii) But-1-yne and Buta-1, 3-diene (iii) 1-aminobutane and 1-amino-2-methylpropane.

Explanation

To determine the type of isomerism exhibited by the given pairs of compounds, we will analyze each pair one by one.

### Step 1: Identify the first pair - Butan-1-ol and Butan-2-ol
1. **Draw the structures**:
- Butan-1-ol: CH3-CH2-CH2-CH2OH (the hydroxyl group is on the first carbon)
- Butan-2-ol: CH3-CH2-CHOH-CH3 (the hydroxyl group is on the second carbon)

2. **Analyze the isomerism**:
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