8.今有两种有色物质M和N，已知其透光率关系为lgT_N－lgT_M＝1，那么其吸光度关系

A_N－A_M为

A.1                                                                                B.2

C.－2                                                                            D.－1

9.在醇类化合物中，O—H伸缩振动频率随溶液浓度的增加，向低波数方向位移的原因是

A.溶液极性变大                                                         B.形成分子间氢键随之加强

C.诱导效应随之变大                                                 D.易产生振动偶合

10.下列化合物能发生麦氏重排的是

A.CH₃CH₂CH₂COCH₃                                                B.CH₃CH₂COCH₃

C.(CH₃)₂CHCOCH₃                                                    D.CH₃CH₂CH₂COC(CH₃)₃

11.某试样质谱图的M和M+2峰的丰度比为3∶1，则分子中一定有

A.一个溴原子                                                             B.一个氯原子

C.两个溴原子                                                              D.两个氯原子

12.色谱柱的选择性可用下列哪个参数来衡量

A.保留值                                                                      B.理论塔板数     

C.相对保留值                                                              D.峰宽

13.利用气-液色谱分析样品，若样品中各组分之间主要差别为极性，一般选用的固定液为

A.非极性固定液                                                         B.极性固定液

C.中等极性固定液                                            &n