Which of the following is not a resonance str | vedclass

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(D) Resonance structures must have the same number of electrons and the same atomic connectivity. Option $A$ shows an enolate anion where the negative

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(D) Resonance structures must have the same number of electrons and the same atomic connectivity. Option $A$ shows an enolate anion where the negative charge is on the oxygen atom,which is a valid resonance contributor for the enolate system. Options $B$ and $C$ represent valid resonance forms where the negative charge is delocalized on the carbon atoms of the conjugated system. Option $D$ shows a negative charge on the bridgehead carbon. In this bicyclic system,placing a negative charge at the bridgehead carbon is highly unstable due to the geometric constraints (Bredt's rule related considerations) and it does not represent a valid resonance contributor that can be formed by the delocalization of the pi electrons from the other structures. Therefore,the structure in option $D$ is not a valid resonance structure of the others.

Which of the following is not a resonance structure of the others?

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