 | + |  | + |  |
| X2 (where X is Cl or Br) | + | FeX3 | + | benzene |
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| This product can have sevaral resonance forms. |
 | |  | + | HX | + | FeX3 |
Electron movement arrows are red; bonds and atoms that are affected are blue. The colors have no impact on the structures or mechanisms; they are just there for clarity.
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