Using the reagents below, list in order (by letter, no period) those necessary to prepare compound B from propene (show the addition of the CN before electrophilic addition reactions with the alkene). Note: Not all spaces provided may be needed. Type "na" in any space where you have no reagent. a. Br2 b. Br2 c. NaCN d. HCN e. NBS, light f. Br2, H2O g. NaOEt, EtOH