题目内容

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

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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

In the infrared absorption spectrum, the C-C vibration absorption peak of aromatic hydrocarbon appears at（）

A. 2400～200 cm-1
B. 1650～1450 cm-1
C. 1900～1650 cm-1
D. 1000～650 cm-1

Among the following compounds, the highest frequency of C-O stretching vibration is（）

A. RCOH
B. RCOF
C. RCOCl
D. RCOR

When using infrared analysis, the solvent that should be selected is（）

A. methanol
B. carbon tetrachloride
C. chloroform
D. n-hexane