CH + Using the reagents below, list in order (by letter, no period) those necessary to prepare 2-butyne from acetylene. Note: Not all spaces provided may be needed. Type "na" in any space where you have no reagent. a. Br, heat, light b. Na, (-H) c. Nal(SN2) d. NH4NO3 e. 1) NaNH2, liq. NH3, 2) CH3Br f. (CH3)3COK, (CH3)3COH, heat g. NaOEt, EtOH, heat Step #1 Step #2 Step #3