AP Chemistry Exam Prep

Category - AP Chemistry

Which of the following molecules acts as a Lewis acid?
  1. HCl
  2. SO42-
  3. CCl4
  4. H3PO4
  5. BH3
Explanation
Answer: BH3

A Lewis acid is an electron pair receiver. In the context of the question, the only molecule that readily receives electron pairs is BH3. Therefore, BH3 is a Lewis acid.
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