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Topic 2.6 · Resonance and Formal Charge

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AP Chemistry · Topic 2.6: Resonance and Formal ChargeOpen topic

Original PrepAtlas question. This is not an official College Board question.

The two usual Lewis resonance contributors for O3 place a single O–O bond on opposite sides of the central oxygen. Measurements show that the two O–O bonds in one ozone molecule have equal lengths. Which interpretation is consistent with these observations?

AThe molecule rapidly switches between one long bond and one short bond, and the measurement proves that each bond is always either purely single or purely double.BThe actual electron distribution is delocalized; neither individual contributor alone describes the two equivalent bonds.CThe two contributors describe different compounds that must be present as an equal mixture.DThe oxygen nuclei exchange positions every time the electrons move.

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Topic 2.6 · Resonance and Formal Charge

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