Hot concentrated sulphate acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?

Question

Cu + 2H₂SO₄ $ \to $ CuSO₄ + SO₂ + 2H₂O

S + 2H₂SO₄ $ \to $ 3SO₂ + 2H₂O

C + 2H₂SO₄ $ \to $ CO₂ + 2SO₂ + 2H₂O

CaF₂ + H₂SO₄ $ \to $ CaSO₄ + 2HF

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