Predicting SN2 vs E2 Selectivity For each set of conditions, circle the favored reaction and draw the major product. If the product has stereocenter(s), include stereochemistry, drawing the major configurational isomer formed. Assume the reactions are irreversible. Make sure the correct atoms of substituents are attached to the rest of the molecule. E.g., for NaCN, which atom of CN is nucleophilic? It might be helpful to number carbons. (a) Favored reaction (circle one): SN2 or E2 H3C I H3C NaOCH3 tBu 23 °C (b) Favored reaction (circle one): SN2 or E2 H3C. CH3 Br NaSCH3 23 °C