Chemistry - GOC Question with Solution | TestHub

In tropone the ${\mathrm{C}}^{+}-{\mathrm{O}}^{-}$ form is aromatic (6π tropylium oxide), so it contributes strongly and the dipole is large. In cyclopentadienone the ${\mathrm{C}}^{+}-{\mathrm{O}}^{-}$ form is anti-aromatic (4π), so the charge-separated form is suppressed. So a $>$ b.