题目内容
In the NMR spectrum of CH3CH2CH3, the proton signal of CH2 is split into ( ) by the proton coupling of CH3.
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In the 1H NMR spectrum of CH3CH2OCH(CH3)2, the ratio of area of various proton signals is 9:2:1.
The hydrogen bond has a great influence on the proton chemical shift of active hydrogen.
In the infrared spectrum, there are two obvious absorption bands in the range of 3500～3100 cm-1, then the most likely compound is（ ）
In the infrared spectrum, the absorption peak in the high frequency region near 3000 cm-1 is mainly caused by（ ）
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