Write the name and structural formula of one functional isomer of acetic acid.

Explanation

To find a functional isomer of acetic acid (CH₃COOH), we need to identify a compound that has the same molecular formula (C₂H₄O₂) but a different functional group.

### Step-by-Step Solution:

1. **Identify the Molecular Formula of Acetic Acid**:
- Acetic acid has the molecular formula C₂H₄O₂.

2. **Determine the Functional Group of Acetic Acid**:
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