Question 1

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

Accepted Answer

A)   CH4− ⋅ + 2 e−
B)   CH3− + H⋅
C)   CH4+⋅ + 2 e−
D)   CH3⋅ + H+ + 2 e−E) None of the above
F) A) and B) C

Question 2

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?

Accepted Answer

The answer of What is the most likely molecular formula...

Question 3

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

Accepted Answer

A)   flight averaged bumping
B)   fast atom bombardment
C)   fragmented atom beam
D)   flying atom bashingE) A) and C)
F) B) and C) B

Question 4

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

Accepted Answer

The answer of Dehydration of the following compound will produce...

Question 5

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

Accepted Answer

A)   1-octyne
B)   4-octyne
C)   5-methyl-3-octyne
D)   2,2-dimethyl-3-heptyneE) A) and D)
F) B) and D)

Question 6

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

Accepted Answer

A)  EI-MS
B)  FAB
C)  MALDI
D)  ESI-MSE) A) and C)
F) C) and D)

Question 7

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

Accepted Answer

A)   M − 29
B)   M − 18
C)   M − 15
D)   M − 12E) None of the above
F) All of the above

Question 8

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

Accepted Answer

A)   two radicals
B)   an anion and a cation
C)   a radical and a cation
D)   two cationsE) A) and B)
F) A) and C)

Question 9

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

Accepted Answer

The answer of Refer to the mass spectrum of 2-methylbutane...

Question 10

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

Accepted Answer

A)  EI-MS
B)  FAB
C)  MALDI
D)  ESI-MSE) B) and D)
F) B) and C)

Question 11

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

Accepted Answer

A)   1-hexanol
B)   2-hexanol
C)   hexanal
D)   hexanoic acidE) A) and D)
F) A) and B)

Question 12

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

Accepted Answer

The answer of This compound contains C, H, and one...

Question 13

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

Accepted Answer

A)   C6H12Cl2
B)   C7H10N2
C)   C8H13N
D)   C8H14Br2E) All of the above
F) A) and B)

Question 14

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

Accepted Answer

A)   1-hexene
B)   3-methyl-1-hexene
C)   4-methyl-1-hexene
D)   5-methyl-1-hexeneE) B) and D)
F) None of the above

Question 15

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.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

A)   [H2C=CH2]+\left[\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}\right]^{+}[H2​C=CH2​]+ 
B)   [H3C−NH2]+\left[\mathrm{H}_{3} \mathrm{C}-\mathrm{NH}_{2}\right]^{+}[H3​C−NH2​]+ 
C)   [H2C=NH2]+\left[\mathrm{H}_{2} \mathrm{C}=\mathrm{NH}_{2}\right]^{+}[H2​C=NH2​]+ 
D)   [H3C−CH3]+\left[\mathrm{H}_{3} \mathrm{C}-\mathrm{CH}_{3}\right]^{+}[H3​C−CH3​]+E) B) and C)
F) All of the above

Question 18

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

Accepted Answer

A)   Only I
B)   Only II
C)   Only I and II
D)   Only II and IIIE) A) and B)
F) A) and C) C

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A)   X is , and Y is .
B)   X is , and Y is .
C)   X is , and Y is .
D)   X is , and Y is .E) None of the above
F) A) and C)

Exam 14: Mass Spectrometry

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

Correct Answer
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C

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?

Correct Answer
verified

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

Correct Answer
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B

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

Correct Answer
verified

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

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

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

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

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

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

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

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

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

Correct Answer
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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.

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

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

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

Correct Answer
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C

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

Correct Answer
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Identify the ions "X" and "Y" in the given reaction.

Correct Answer
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Exam 14: Mass Spectrometry

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

Correct AnswerverifiedC

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
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C

Correct Answer
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Correct Answer
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B

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

Correct Answer
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C

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

Correct Answer
verified

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

Correct Answer
verified