Which of the following molecules or ions does not have one or more resonance structures? A) O₃ B) OCN^- C) SO₂ D) H₂CO E) NO₃^-

Question

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The molecule H₂CO, also known as thioformaldehyde, does not have any resonance structures due to the fact that the sulfur atom cannot form double bonds with both the carbon and hydrogen atoms simultaneously. The other molecules in the list have at least one resonance structure.

Which of the Following Molecules or Ions Does Not Have