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Exam 14: Mass Spectrometry

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Question 1

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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?

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4-methyl-2...

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Question 2

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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.

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Question 3

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Which of the following gives rise to a prominent peak in the mass spectrum at m/z of 39?

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.

What are products of the collision between high energy electrons and methane?

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

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.

What is the y-axis of a mass spectrum?

What is the x-axis of a mass spectrum?

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

Which of the following bonds of the octane radical cation is least subject to fragmentation?

Which C₅H₁₂O compound give the following EI mass spectrum?

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?

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?

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

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

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

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

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.

Mass spectrometry and infrared spectroscopy are complementary techniques because mass spectrometry provides information about the molar mass and formula while infrared spectroscopy helps identify the functional groups in the formula.