please answer all 3 questions

Current Attempt in Progress What is wrong with the mechanism shown? There is no leaving group, so there should be no arrows. The arrow should be removing a proton from the H2O group. An arrow is also needed to indicate the loss of the leaving group. The arrow indicating the formation of the CBr bond (nucleophilic attack) should start at the bromide anion. Identify the sequence of curved arrows (electron movement) in the steps of the reaction shown. proton transfer, proton transfer, nucleophilic Attack proton transfer, loss of leaving group nucleophilic attack, proton transfer, loss of leaving group proton transfer, nucleophilic attack, proton transfer Which of the following mechanisms correctly uses curved arrows to show the movement of electrons? OH2 II B III IV v