题目内容

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

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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

Which of the following nucleus exhibit zero nuclear magnetic moments and do not produce nuclear magnetic resonance signals? ( )

A. 2H, 14N
B. 19F, 12C
C. 1H, 13C
D. 16O, 12C

From the NMR spectra of ethylene and acetylene, the proton chemical shift values are 5.8 and 2.8, respectively. The reason for the large chemical shift value of proton peaks of the ethylene is ( ).

A. induced effect
B. anisotropic effect
C. spin-spin coupling
D. conjugation effect