Among the following compounds,the one which s | vedclass

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(A) The compound in option $A$ shows the highest dipole moment. This is because the molecule undergoes charge separation where the three-membered ring

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(A) The compound in option $A$ shows the highest dipole moment. This is because the molecule undergoes charge separation where the three-membered ring acquires a positive charge ($2 \pi$ electrons,$H$ückel's rule $4n+2$ with $n=0$,aromatic) and the five-membered ring acquires a negative charge ($6 \pi$ electrons,$H$ückel's rule $4n+2$ with $n=1$,aromatic). Since both rings become aromatic upon charge separation,the resonance contributor with separated charges is highly stable,leading to a very large dipole moment.

Among the following compounds,the one which shows the highest dipole moment is

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