Question 1

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) None of the above
F) B) and D)

Question 2

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.

Accepted Answer

A) True 
 B)False

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

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+.

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A)  cyclopentane
B)  cyclopentene
C)  cyclopentanol
D)  methylcyclopentaneE) B) and C)
F) None of the above

Question 6

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

Accepted Answer

A)  the peak corresponding to the most abundant ion
B)  the peak corresponding to the ion with lowest m/e
C)  the peak corresponding to the molecular ion peak
D)  the peak corresponding to the ion arising to loss of a proton from the molecular ionE) None of the above
F) B) and D)

Question 7

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.

Accepted Answer

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

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

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) B) and C)
F) None of the above

Question 10

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 _______.

Accepted Answer

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

Question 11

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) A) and D)
F) C) and D)

Question 12

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

Accepted Answer

A)  electron injection
B)  electron impact
C)  energy initiated
D)  energy insertionE) A) and B)
F) A) and C)

Question 13

Which C5H12O compound give the following EI mass spectrum?

Accepted Answer

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

Question 16

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 ___________________.

Accepted Answer

Question 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

A)  2-methylhexanoic acid
B)  methyl hexanoate
C)  ethyl hexanoate
D)  hexanoic acidE) None of the above
F) C) and D)

Question 19

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 B)
F) All of the above

Question 20

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+.

Accepted Answer

Exam 14: Mass Spectrometry

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+.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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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+.

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

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

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Which C5H12O compound give the following EI mass spectrum?

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

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 ___________________.

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

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 _______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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⁺.

Correct Answer
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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. +CH₂CH₃

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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⁺.

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Which C₅H₁₂O compound give the following EI mass spectrum?

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

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

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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.

Correct Answer
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Correct Answer
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