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Bronsted-Lowry Acid

A Bronsted-Lowry acid, like an Arrhenius acid, is a compound that breaks down to give an H+ in solution.

Lewis Acid

A Lewis acid refers to an atom or molecule that accepts an electron pair. 

Lewis Acid Examples in Organic Chemistry

  • Borane – BH3 (hydroboration reaction)
  • Aluminum Chloride – AlCl3 (electrophilic aromatic substitution reaction)
  • Iron (III) Bromide – FeCl3 (electrophilic aromatic substitution reaction)
  • and H+
  • A Lewis acid is an electron pair acceptor.

  • A Lewis base is an electron pair donor.

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