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Among the following compounds, the compound which shows the highest dipole-moment is
Dipole moment depends on:
(I) shows strong charge-separated resonance (cyclopropenone ↔ cyclopropenyl cation + O⁻), leading to a very large dipole moment.
In (II) and (III), conjugation causes delocalization, which reduces effective dipole magnitude.
In (IV), due to symmetry, dipoles largely cancel out
Thus, order of dipole moment: $$I>II>III>IV$$
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