题目内容

The hydrogen bond has a great influence on the proton chemical shift of active hydrogen.

查看答案

搜索结果不匹配？点我反馈

更多问题

In the infrared spectrum, there are two obvious absorption bands in the range of 3500～3100 cm-1, then the most likely compound is（）

A. (C6H5)CONH(C6H5)
B. (C6H5)COOH
C. (C6H5)CO(C6H5)
D. (C6H5)CONH2

In the infrared spectrum, the absorption peak in the high frequency region near 3000 cm-1 is mainly caused by（）

A. stretching vibration of C-C, C-O
B. stretching vibration of C-H, O-H, N-H
C. stretching vibration of C=C, C=O
D. stretching vibration of C≡C, C≡N

In alcohol compounds, due to the strengthening of the intermolecular hydrogen bond, the O-H stretching vibration frequency （） with the increase of the solution concentration.

A. moves towards low wavenumber
B. moves towards high wavenumber
C. No change
D. A and B are both possible

It is known that a certain compound does not have any absorption peak in the ultraviolet region, but has a broad and strong absorption band in the infrared spectrum from 3400 to 3200 cm-1, then the most likely compound is（）

A. carboxylic acid
B. alcohol
C. primary amine
D. ether