All are Lewis acids except:
Correct answer: B. H2O
- A. BF3
- B. H2O
- C. AlCl3
- D. FeCl3
Explanation
The correct answer is H2O. Water is a Lewis base because it has lone pairs of electrons on the oxygen atom that can be donated to form a bond with a Lewis acid. In contrast, BF3, AlCl3, and FeCl3 are all Lewis acids as they can accept electron pairs. BF3 has an empty p orbital on boron, AlCl3 can accept electrons due to its electron-deficient aluminum atom, and FeCl3 can accept electron pairs through its iron atom.
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