Please explain

Non-scaffolded Mechanism Problem: Reactions of Alcohols - with Feedback 2 of 10 HI Review | Constants Periodic Table Part A Draw a mechanism for the following reaction: CH3 -Br CH H-BI , CH, Edit the reaction by drawing all steps in the appropriate boxes and connecting them with reaction arrows. Add charges where needed. Electron-flow arrows should start on an atom or a bond and should end on an atom, bond, or location where a new bond should be created