题目内容

The peak with the largest mass-to-charge ratio in the mass spectrum must be the molecular ion peak.

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The square of the ion's radius of motion in the mass spectrometer is proportional to the strength of the magnetic field.

1H NMR spectrum of a compound (C10H14) shows two sets of single peak at δ = 7.2 (a) and δ = 1.3 (b) respectively. The ratio of peak area is a:b = 5:9. The structure of the compound is ( ).

A. (C6H5)CH2CH(CH3)2
B. (C6H5)CH(CH3)CH2CH3
C. (C6H5)C(CH3)3
D. (C6H5)CH2CH2CH3

The NMR spectrum of ClCH2-CH2Cl molecule is expected after spin-spin splitting ( ).

A. has 4 proton peaks
B. has 2 proton peaks
C. does not exhibit splitting
D. has 5 proton peaks

Which of the following compounds shows the smallest chemical shifts of protons? ( )

A. CH3F
B. CH4
CH3Cl
D. CH3Br