Which of the following compounds is not reson | vedclass

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(C) In option $C$,the carbanion is located at the bridgehead position of a bicyclo[$2.2$.$1$]heptane system. According to Bredt's rule,a double bond c

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(C) In option $C$,the carbanion is located at the bridgehead position of a bicyclo[$2.2$.$1$]heptane system. According to Bredt's rule,a double bond cannot be placed at the bridgehead position in a small bicyclic system because it would introduce excessive ring strain and prevent the necessary planar geometry for $p$-orbital overlap. Therefore,the lone pair on the bridgehead carbon cannot delocalize into the carbonyl group,making it not resonance stabilized.

Which of the following compounds is not resonance stabilized?

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