Carbonate Ion Bond Order and Resonance
Which of the following pieces of evidence best supports the conclusion that the carbonate ion exhibits an average bond order of approximately due to resonance?
Resonance Evidence for Carbonate Ion:
The carbonate ion has three valid Lewis structures with bond orders of 1, 2, and 1 respectively. The average bond order is calculated as: .
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 , which is consistent with experimental observations of bond lengths and strengths in the carbonate ion.
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.
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