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Exam 14: Mass Spectrometry

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Question 31

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How many carbon atoms are present in a molecule which gives an M+1 peak that is 5.74% of the intensity of the molecular ion?

A) 5
B) 6
C) 11
D) 12

E) A) and B)
F) A) and C)

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Question 32

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

A) hexane
B) 1-chloropentane
C) 1-pentanol
D) 3-methylpentane

E) A) and B)
F) A) and C)

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Question 33

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The following question(s) refer to the mass spectrum shown below. Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -This compound contains C, H, and one other atom. The other atom from the mass spectrum is __________.

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

It is not possible distinguish 2,2-dimethylbutane from 2-methylpentane using mass spectrometry.

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 following species.

What is the most likely molecular formula of a compound that has a molecular ion in the EI mass spectrum with m/z of 97 and an M+1 peak that is 6.6% of the intensity of the molecular ion peak?

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

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

Which of the following is not prominent in the mass spectrum of 2-methyl-2-butanol?

A monochloroalkane shows two parent ion peaks m/z at 92 and 94. The molecular formula of this compound might be C₃H₇Cl.

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

Which C₆H₁₂O carbonyl-containing compound shows a molecular ion peak at m/z 100 and significant fragment peaks at m/z 71, 58, 57, 43 and 29 in the EI mass spectrum?

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

Which of the following sets of molecular ions does an alkyl bromide possess?

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 91?

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

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

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.

The following question(s) refer to the mass spectrum shown below. Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/ -The base peak in this spectrum occurs at a m/z of ______.