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Exam 14: Mass Spectrometry

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Question 21

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

A) two molecular ions in a 2:1 ratio separated by two mass units
B) two molecular ions in a 1:1 ratio separated by two mass units
C) three molecular ions in a 1:2:1 ratio separated by two mass units
D) two molecular ions in a 3:1 ratio separated by two mass units

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

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Question 22

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Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 60?

A) 1-hexanol
B) 2-hexanol
C) hexanal
D) hexanoic acid

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

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Question 23

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

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

Provide the mass of the three most prominent fragment peaks that are observed in the EI mass spectrum of methyl pentanoate, CH₃CH₂CH₂CH₂CO₂CH₃ (molecular ion m/z = 116) and describe the processes that lead to each of these fragments.

Match the terms with their descriptions. -Sample is charged by passing it through a charged capillary tube

Match the terms with their descriptions. -Sample is bombarded with high-energy particles such as xenon atoms

What is the most likely molecular formula of a compound that has a molecular ion in the EI mass spectrum with m/z of 120, with a M+1 and M+2 peaks that are 6.6% and 24% of the intensity of the molecular ion peak, respectively.

What is the most likely molecular formula of a compound (that contains only C, H and O) which has a molecular ion in the EI mass spectrum with m/z of 104 and an M+1 peak that is 5.5% of the intensity of the molecular ion peak?

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?

Which C₅H₁₂O compound give the following EI mass spectrum?

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 30?

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 ______.

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

Which C₆H₁₂O carbonyl-containing compound shows a molecular ion peak at m/z 100 and significant fragment peaks at m/z 85, 58, 57, 43 and 42 in the EI mass spectrum?

What is the most likely molecular formula of a compound that has a molecular ion in the EI mass spectrum with m/z of 136, with a M+1 and M+2 peaks that are 4.4% and 49% of the intensity of the molecular ion peak, respectively.

C₆H₁₅N could have a mass spectrum with M⁺ at m/z = 101 with a minor M+1 peak.

Which of the following bonds of the octane radical cation is least subject to fragmentation? $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$ $\quad$$\quad$ i $\quad$$\quad$$\quad$ ii $\quad$$\quad$$\quad$ iii $\quad$$\quad$ iv

What is the x-axis of a mass spectrum?

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