If one of those -OH groups was a Cl instead I know how it would proceed, but what happens here?

Item 11 11 of 15 Draw a mechanism for the following reaction: . CH HEC wx HC CH3 HC CH, OH Draw all missing reactants and/or products in the appropriate boxes by placing atoms on the canvas and connecting them with bonds. Add charges where needed. Electron-flow arrows should start on the electron(s) of an atom or a bond and should end on an atom, bond, or location where a new bond should be created. View Available Hint(s) OCH H C HC Ha N Puth Em o Z S CH HO, 0 0 3 2 0 +fS. C Br 1 P T HO) F