Compare the dipole moments of the two bromides (a) and (b). Is the dipole moment of (a) greater than, less than or equal to that of (b) ?
(a) (b)

Question

Compare the dipole moments of the two bromides (a) and (b). Is the dipole moment of (a) greater than, less than or equal to that of (b) ? (a) (b)

TestHub · Accepted Answer

(a) 3-bromocyclopropene can ionise to the cyclopropenyl cation (2π, aromatic) and B r − , so its C-Br bond is strongly ionic. (b) bromocyclobutane would give an ordinary, unstabilised cation, so its C-Br bond is much less polar. So a > b.

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