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Exam 14: Mass Spectrometry

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Question 21

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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 the following species.

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Question 22

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

A) the most abundant ion
B) the ion with the smallest m/e
C) the ion formed by removal of an electron from the molecule
D) any ion formed by fragmentation of the molecule

E) A) and C)
F) None of the above

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Question 23

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The mass spectrum of 1-pentanol shows an intense daughter ion peak at m/z = 31. This peak could be due to the formation of CH₃O⁺.

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.

Which C₅H₁₂O compound give the following EI mass spectrum?

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

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. +CH₂CH₃

Which of the following gives rise to a prominent M - 15 peak in the mass spectrum?

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of M - 31?

Which of the following does not give rise to a prominent M - 41 peak in the mass spectrum?

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

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

Which of the molecules gives rise to a molecular ion with an odd value of m/z?

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

Consider the following mass spectrum C₅H₁₂O might have been used to produce this spectrum.

Both mass spectrometry and infrared spectroscopy involve the interaction of molecules with electromagnetic energy.

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⁺.

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 mass of the larger charged fragment produced by the dehydration of the following compound occurs at a m/z of _______.

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 45?

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/ -Cyclohexene and hex-2-yne both have the molecular formula, C₆H₁₀. The mass spectrum below belongs to ___________________.