习题.-|||-1.用系统命名法命名下列化合物。-|||-CH3-|||-(1) C=C C2H5 CH(C H3)2 -|||-H-|||-CH3-|||-CH3-|||-(2) (H)_(3)C(H)_(2)C-C=!=!= CHC(H)_(2)CHC(H)_(3)-|||-CH3CH3-|||-(3) (H)_(3)C(H)_(2)CH=CHCH(C(H)_(3))_(2)-|||-(4) (H)_(3)C(H)_(2)CH=CHC(H)_(2)C(H)_(2)C(H)_(2)Cl