Write chemical reaction to affect the following transformations :
Butan-1-ol `to` Butanoic acid.

Explanation

To convert Butan-1-ol to Butanoic acid, we can follow these steps:

### Step 1: Write the structure of Butan-1-ol
Butan-1-ol has the following structure:
- **Chemical formula**: C₄H₉OH
- **Structure**: CH₃-CH₂-CH₂-CH₂OH

### Step 2: Oxidation of Butan-1-ol to Butanal
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