EAS Halogenation: Bromination/Chlorination of Benzene (Lewis Acid Catalysis)

Learn EAS halogenation: generating Br+ (or Cl+) with FeBr3/AlCl3, sigma complex formation, and how halogens are deactivating yet ortho/para directing.

Reaction: Arene → haloarene
What it does: Installs Br or Cl onto aromatic ring
Typical reagents: Br2/FeBr3 or Cl2/AlCl3
Key intermediate: Sigma complex
Driving force: Re-aromatization by deprotonation
Exam type: Predict regio
Exam type: Mechanism steps

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