Chemistry - GOC Question with Solution | TestHub

(b) 7-bromocycloheptatriene can ionise to the tropylium ion (6π, aromatic) and $B{r}^{-}$, so its C-Br bond is strongly ionic. (a) would give a non-aromatic, unstabilised carbocation, so its C-Br bond is much less polar. So a $<$ b.