题目内容

醇类化合物的O-H键伸缩振动频率随着溶液浓度的增大而？

A. 向高波数移动
B. 向低波数移动
C. 无变化
D. A、B都有可能

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下面哪些因素可以影响基团的吸收频率？

A. 共轭效应
B. 氢键
C. 费米共振
D. 诱导效应

下面哪种说法是正确的？

A. 键的振动频率与力常数k成正比
B. 键的振动频率与原子量成反比
C. 没有偶极矩变化的振动跃迁，无红外活性
D. 所有的振动形式都可以产生红外吸收

在红外吸收光谱中，分子振动时，键或基团______不发生变化时，没有红外活性？

Directions: Listen to a conversation and choose the best answer from the four choices provided for each question.[音频]1.A) He’s going to work. B) He’s going shopping. C) He’s going home from work. D) He’s going to school from home.2.A) He studies the next day. B) He has no time to study. C) He stays up all night to study. D) He studies when he’s not exhausted.3.A) Because he doesn’t have any student loans. B) Because he doesn’t want to use his parents’ money. C) Because he doesn’t have to worry about his studies. D) Because he doesn’t want to owe too much in student loans.4.A) He has experience in managing difficult people. B) He knows the value of his work at the supermarket. C) He has experience in dealing with difficult situations. D) He knows how to make better choices between work and study.