题目内容

For compounds composed of C, H, O, and N, the mass numbers of the molecular ion peaks of the mass spectrum are even numbers.

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

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