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(A) The dipole moment of a molecule is directly related to the polarity of its bonds and the contribution of its resonance structures. For compound $I

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$I$

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(A) The dipole moment of a molecule is directly related to the polarity of its bonds and the contribution of its resonance structures. For compound $I$ (cyclopropenone),the resonance structure involves the transfer of electrons from the $C=O$ bond to the oxygen atom,resulting in a positive charge on the three-membered ring. This resonance structure is aromatic because the ring contains $2 \pi$ electrons ($H$ückel's rule,$4n+2$ where $n=0$),which provides significant stability. Due to this aromatic character,the dipolar resonance structure makes a major contribution to the overall electronic structure,leading to a very high dipole moment compared to the other compounds where such aromatic stabilization of the dipolar form is not present.

Which of the following compounds will show the highest dipole moment?

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