下列每一对化合物，哪一个更易进行S1反应？ CH3 a.CH3CH2CH2CHCH3 CH3CH2CCH3 (A) Br (B) (B) CH2Br (A) Br (A) (B) 下列每一对化合物，哪一个更易进行S2反应？ Cl a. CH;CH2CH2CCH3 CH3CH2CH2CHCH3 (B) CH3 ci CH3 (A) (B) b.CH3CCHCH3 CH3CH2CHCHCH3 H:CI H;C (B) (A) B下列每一对化合物，哪一个更易进行SN1反应？ (B) (A) 下列每一对化合物，哪一个更易进行SN2反应？ (B) (B) a. CH3CH2CH2CHCH3 CH3CH2CCH3 Br Br CH3 b. (A) (B) (A) (B) CH Br CH2Br a. CH3 CH2 CH2 CCH3 CH3 Cl CH3 CH2 CH2 CHCH3 Cl (A) (B) b. CH3 CCHCH3 H3 C I CH3 CH3 CH2 CHCHCH3 I (A) (B) H3 C