Which among the following is a Lewis acid? (a) NH3 (b) NH4+ (c) BF3 (d) H2O

Answer: (c) BF3

Lewis acids are electron-pair acceptors. BF3 is a Lewis acid

Lewis acids

In 1923 G. N. Lewis suggested another way of looking at the reaction between H+ and OH ions. In the Lewis theory of acid-base reactions, bases donate pairs of electrons, and acids accept electrons’ pairs. Therefore, a Lewis acid is any substance, such as the H+ ion, that can accept a pair of nonbonding electrons.

  • A Lewis acid is an electron-pair acceptor.
  • A Lewis base is any substance, such as the OH ion, that can donate a pair of nonbonding electrons.
  • The Lewis theory suggests that acids react with bases to share a pair of electrons, with no change in any atoms’ oxidation numbers.

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