10-Bromo--chamigrene, a compound isolated from marine algae, is thought to be biosynthesized from -bisabolene by the following...

10-Bromo-α-chamigrene, a compound isolated from marine algae, is thought to be biosynthesized from γ-bisabolene by the following route: Draw the structures of the intermediate bromonium and cyclic carbocation, and propose mechanisms for all three steps.

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Cyclic carbocation -H*) Bromonium "Br*" Bromo- Base ion Br peroxidase y-Bisabolene 10-Bromo-a- chamigrene