题目内容
In the infrared spectrum, there are two obvious absorption bands in the range of 3500～3100 cm-1, then the most likely compound is（ ）
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In the infrared spectrum, the absorption peak in the high frequency region near 3000 cm-1 is mainly caused by（ ）
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.
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（ ）
In the infrared absorption spectrum, the C-C vibration absorption peak of aromatic hydrocarbon appears at（ ）
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