Write the tautomerism in sulphurous acid.

Explanation

To write the tautomerism in sulfurous acid, we need to identify the two tautomeric forms that can exist for this compound. Tautomerism is a type of isomerism where compounds can readily interconvert by the movement of a proton and a shift of a double bond.

### Step-by-Step Solution:

1. **Identify the Structure of Sulfurous Acid**:
- The chemical formula for sulfurous acid is H₂SO₃. It consists of a sulfur atom bonded to three oxygen atoms, with one of the oxygen atoms being part of a hydroxyl group (-OH).

2. **Draw the First Tautomeric Form**:
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