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MHT CET Medical202624 April 2026Morning ShiftChemistryHydrocarbonsActual

Chlorobenzene is formed by the reaction between benzene and chlorine in presence of AlCl ₃ . Which of the following species actually attacks the benzene ring in this reaction?

Options

  1. ACl ^-
  2. BCl ₂
  3. CCl ^+
  4. DAlCl ₄^-

Correct answer

C. Cl ^+

Step-by-step solution

The reaction of benzene with chlorine in the presence of AlCl ₃ is an electrophilic aromatic substitution. The Lewis acid AlCl ₃ reacts with Cl ₂ to generate the chloronium ion, Cl ^+ , which acts as an electrophile. Cl ₂ + AlCl ₃ Cl ^+ + AlCl ₄^- The electrophile Cl ^+ then attacks the electron-rich benzene ring to form a resonance-stabilized carbocation (sigma complex). Thus, the species that actually attacks the benzene ring is Cl ^+ . Answer: Cl ^+

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