Which of the following is not a resonating st | vedclass

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(C) Resonating structures must have the same arrangement of atoms and the same total number of electrons. In the given options,$A$ represents the enol

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(C) Resonating structures must have the same arrangement of atoms and the same total number of electrons. In the given options,$A$ represents the enolate form where the negative charge is delocalized on the oxygen atom. Options $B$ and $D$ represent valid resonance contributors where the negative charge is on the alpha or beta carbons respectively,delocalized through the pi system. Option $C$ shows a negative charge on the bridgehead carbon. According to Bredt's rule and the geometry of the system,placing a negative charge (or a double bond) at the bridgehead position in a small bicyclic system is highly unstable and does not contribute significantly to the resonance hybrid of the enolate. Therefore,it is not considered a valid resonating structure in this context.

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

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