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MP DTE Aryl Halides — practice questions

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Aryl Halides questions and exercises with answers

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**Aryl halides are prepared** by direct halogenation of arenes with which catalyst?Read the answer and worked solution →

Worked practice questions

**Aryl halides are prepared** by direct halogenation of arenes with which catalyst?

  1. Pd/C
  2. Na metal
  3. Anhydrous Lewis acid (e.g. FeCl₃, AlCl₃, FeBr₃)
  4. Concentrated H₂SO₄
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Correct answer: C. Anhydrous Lewis acid (e.g. FeCl₃, AlCl₃, FeBr₃)

**Electrophilic aromatic substitution:** Lewis acid (FeX₃, AlCl₃) activates X₂ by polarising it. Generates electrophile X⁺ that attacks the aromatic ring. Direct halogenation with Cl₂/Br₂ works F₂ is too reactive, I₂ needs oxidant to drive the equilibrium.

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