Which of the following statements is incorrect?
- AHaber's process for $NH_3$ synthesis requires iron as a catalyst.
- BFriedel-Crafts reaction uses anhydrous $AlCl_3$ as a catalyst.
- CHydrogenation of oils uses iron as a catalyst.
- DOxidation of $SO_2$ to $SO_3$ requires $V_2O_5$ as a catalyst.
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