SAT Chemistry

Category - Multiple Choice

Which of the following molecules exhibits resonance?
  1. H2O
  2. CO2
  3. O2
  4. O3
  5. SO2
Explanation
Answer: O3

Resonance occurs when two or more bonds show double bond character. This effect occurs when a double bond in either location is energetically equal. The best way to identify resonance is to draw Lewis structures. In the context of this question, O3 is the only molecule to exhibit resonance.
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