2. Draw the structure of the missing major organic product(s) or reactant(s) in each of the transformations below including showing stereochemistry when appropriate. For reactions that produce an equal number of stereoisomers as the major product, draw all of those stereoisomers. Provided products are the major products for the reaction. Then, draw the curved arrow mechanism of each reaction. For part c, draw the curved arrow mechanism using each substrate. a) HCI (two possible substrates) b) Br HBr (2 substrates possible, draw the best one) d) HBr HCI Br