2. For the reactions outlined below in 2a2b draw out the reaction mechanism using arrow formalism to describe how the reaction below occurs. Be sure to draw out all reaction intermediates \& the movement of all electrons needed to justify the formation of the indicated products. You do not need to add in any reagents that are not shown OR any other products that could be made but are not shown. (4 points each) 2a. 2b. 1. excess MgBr A tertiary alcohol final 2. H+,H2O product