Which of the following statements is incorrect?

  • A
    Haber's process for $NH_3$ synthesis requires iron as a catalyst.
  • B
    Friedel-Crafts reaction uses anhydrous $AlCl_3$ as a catalyst.
  • C
    Hydrogenation of oils uses iron as a catalyst.
  • D
    Oxidation of $SO_2$ to $SO_3$ requires $V_2O_5$ as a catalyst.

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