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Exam 14: Mass Spectrometry

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Question 31

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Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -The peak at a m/z of _____ represents M⁺.

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Question 32

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Mass spectrometry is an analytical technique used to determine the molecular masses, the molecular formulae, and the _____ of compounds.

A) molecular radicals
B) molecular structures
C) functional groups
D) solubilities

E) All of the above
F) A) and B)

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Question 33

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What is the principle that allows us to use mass spectrometry to determine the molecular weight of a compound?

Loratidine is the active ingredient in the antihistamine Claritin®. Mass spectral analysis of loratidine shows M⁺ at m/z = 382 and M⁺ at m/z = 384 in an approximate ratio of 3:1 in intensity. This data indicates that loratidine contains fluorine.

The mass of the larger charged fragment produced by the dehydration of the following compound occurs at a m/z of _______. $\quad$$\mathrm{CH}_{3} \quad\mathrm{CH}_{3}$ $\quad$$\quad$ | $\quad$$\quad$ | $\mathrm{CH}_{3} \mathrm{CCH}_{2} \mathrm{CHCH}_{2} \mathrm{CH}_{2} \mathrm{OH}$ $\quad$$\quad$ | $\quad$$\mathrm{CH}_{3}$

Which of the following gives rise to a prominent M − 18 peak in the mass spectrum?

Which of the following sets of molecular ions does a dibromoalkane possess?

Alpha cleavage of the following compound would produce fragments at m/z = 43 and m/z = 119.

In mass spectrometry, which of the following phrases is shortened to the acronym "EI"?

What is the y-axis of a mass spectrum?

Alpha cleavage of the following compound will produce a peak at a m/z of _______.

Which of the following alcohols does not give a prominent M − 15 ion?

Which of the following is most consistent with a molecule having a molecular ion with m/e of 77?

Which of the following corresponds to the molecular ion in EI mass spectrometry?

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 41?

Provide the mass of the three most prominent fragment peaks that are observed in the EI mass spectrum of 2-hexanone, CH₃CH₂CH₂CH₂COCH₃ (molecular ion m/z = 100) and describe the processes that lead to each of these fragments.

How many carbon atoms are present in a molecule which gives an M+1 peak that is 11.48% of the intensity of the molecular ion?

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 43?

Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -The peak at a m/z of _____ represents the base peak.

Which of the following gives rise to a prominent M − 18 peak in the mass spectrum?