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Exam 14: Mass Spectrometry

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Question 1

Multiple Choice

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

A) flight averaged bumping
B) fast atom bombardment
C) fragmented atom beam
D) flying atom bashing

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

Correct Answer

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B

Question 2

Multiple Choice

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Identify the compound(s) that will undergo McLafferty rearrangement during a mass spectral analysis. ​

A) Only I
B) Only II
C) Only I and II
D) Only II and III

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

Correct Answer

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C

Question 3

True/False

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

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. $\mathrm{CH}_{3} \stackrel{+}{\mathrm{C}} \mathrm{HCH}_{3}$

Identify the ions "X" and "Y" in the given reaction. ​

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

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

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

This compound contains C, H, and one other atom. The other atom from the mass spectrum is __________.

Match the terms with their descriptions. -Sample is bombarded with high-energy electrons

The mass spectral analysis of toluene showed a base peak at m/z = 91. The base peak is because of _____.

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.

What are the most common products of the fragmentation of a molecular ion?

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

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

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

Match the terms with their descriptions. -Sample is bombarded with photons obtained from a laser source

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

A mass spectral analysis of 3-methyl-1-pentamine showed a base peak at m/z = 30. The base peak is because of _____.