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Which one of the following compounds is not a protic acid?

1. SO₃ (OH)₂
2. B (OH)₃
3. PO (OH)₃
4. SO (OH)₂

Correct answer: B (OH)₃

Solution

B(OH)₃ is not a protic acid because it does not donate protons (H⁺) in solution; instead, it acts as a Lewis acid by accepting electron pairs.

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