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.

Column-$I$	Column-$II$
$A$. Acetaldehyde,vinyl alcohol	$1$. Enantiomers
$B$. Eclipsed and staggered ethane	$2$. Tautomers
$C$. $(+)$$2$-butanol,$(-)$$2$-butanol	$3$. Chain isomers
$D$. Methyl-$n$-propylamine and diethylamine	$4$. Conformational isomers
	$5$. Metamers

Which of the following compounds is not resonance stabilized?

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