APFIVE Which of the following pieces of evidence best supports the conclusion that the carbonate ion $$CO_3^{2-}$$ exhibits an average bond order of approximately $$1.33$$ due to resonance?
Resonance Evidence for Carbonate Ion:
The carbonate ion $$CO_3^{2-}$$ has three valid Lewis structures with bond orders of 1, 2, and 1 respectively. The average bond order is calculated as: $$\text{Bond Order} = \frac{1+2+1}{3} = 1.33$$.
The presence of multiple resonance forms implies that the bond order fluctuates between 1 and 2 rather than averaging to a fixed value.
One resonance form shows a double bond exclusively, suggesting a bond order of 2 without any averaging over multiple forms.
The resonance structures indicate that only the structure with a single bond is valid, leading to an incorrect average bond order.
The resonance forms, when averaged, yield a bond order of $$1.33$$, which is consistent with experimental observations of bond lengths and strengths in the carbonate ion.
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