想三想按由易到难排列下列化合物发生消 除反应的活性次序 Br CH;-CH-CHz-CH2Br CH3-CH2-C-CH3 CH3-CH-CH-CH; CH3 CH Br CH3 ① ② ③ 2 设设设☑ ② > ③ > ① 按由易到难排列下列化合物发生消 ① ② ③ 除反应的活性次序 CH3 CH CH3 CH2 CH2Br CH2 C CH3 CH3 CH3 Br CH CH CH3 CH3 CH3 Br