Bromomethylcycloheptane has been prepared in 92% yield by the reaction shown. Write a step...

Bromomethylcycloheptane has been prepared in 92% yield by the reaction shown. Write a stepwise mechanism and use curved arrows to show electron flow. The reaction was carried out in water, so use H₃O⁺ as the proton donor in your mechanism. Is the rate-determining step unimolecular (S_N1) or bimolecular (S_N2)?