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Mass Spectrometry Quiz

Mass Spectrometry Quiz

Mass Spectrometry Quiz Test Mass spectrometry (MS) is an analytical technique that measures the mass-to-charge ratio of ions. The results are typically presented as a mass spectrum, a plot of intensity as a function of the mass-to-charge ratio.

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Quiz Questions And Answers

Which of the following processes leads to the absorption of infrared radiation by a molecule?

bond vibration
bond breaking
electron excitation
nuclear spin flip

What is the approximate range of wavelengths in the electromagnetic spectrum which corresponds to the width of an infrared spectrum used by chemists to help identify organic comp

400-700 nm
200-400 nm
2.5-25 μm
0.1-10 mm

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the highest energy?

ultraviolet
radio waves
visible
infrared

Which of the following gives rise to a prominent peak in the mass spectrum corresponding to a radical cation formed by McLafferty rearrangement of the molecular ion?

2,4-dimethyl-2-pentanone, (CH3)2CHCOCH(CH3)2
3-pentanone, CH3CH2COCH2CH3
2-methylpropanal, (CH3)2CHCHO
2-pentanone, CH3CH2CH2COCH3

Which of the following gives rise to a prominent peak in the mass spectrum corresponding to 18 mass units less than the molecular ion?

3-methylpentane
1-heptanol
1-chloropentane
octane

Which of the following peaks does not appear in the mass spectrum of hexane?

m/z = 57
m/z = 43
m/z = 36
m/z = 86

Which of the following is the definition of the base peak in a mass spectrum?

The peak corresponding to the most abundant ion
The peak corresponding to the molecular ion
The peak corresponding to the ion with lowest m/z
The peak corresponding to any ion formed by fragmentation of the molecule

Which of the following corresponds to the molecular ion in a mass spectrum?

Any ion formed by fragmentation of the molecule
The most abundant ion
The ion with the smallest m/z
The ion formed by removal of an electron from the molecule

What is plotted along the x-axis of a mass spectrum?

mass/energy
mass/charge
mass × charge
mass

What are the products of the collision between a high energy electron and methane in a mass spectrometer?

[CH4]-.
[CH4]+ . + 2 e.
CH3- + H:-
[CH4]-. + 2 e-
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