题目内容
How many spin orientations does an atomic nucleus with spin quantum number I = 1/2 have in the external magnetic field? ( )
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In the NMR spectrum of CH3CH2CH3, the proton signal of CH2 is split into ( ) by the proton coupling of CH3.
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（ ）
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