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

• A

  $\mathrm{Cu}+2{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{CuSO}}_4+{\mathrm{SO}}_2+2{\mathrm{H}}_2\mathrm{O}$
• B

  $3\mathrm{S}+2{\mathrm{H}}_2{\mathrm{SO}}_4\to 3{\mathrm{SO}}_2+2{\mathrm{H}}_2\mathrm{O}$
• C

  $\mathrm{C}+2{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{CO}}_2+2{\mathrm{SO}}_2+2{\mathrm{H}}_2\mathrm{O}$
• Correct answer
  D

  ${\mathrm{CaF}}_2+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{CaSO}}_4+2\mathrm{HF}$

Hence, the correct answer is option: 'D'.