Question 1

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 41?

Accepted Answer

A)   1-hexene
B)   2-hexyne
C)   3-hexanol
D)   2-chlorohexaneE) C) and D)
F) All of the above

Question 2

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 43?

Accepted Answer

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

Question 3

Which of the following is most consistent with a molecule having a molecular ion with m/e of 77?

Accepted Answer

A)   the molecule contains bromine
B)   the molecule contains nitrogen
C)   the molecule is an alcohol
D)   the molecule is a hydrocarbonE) All of the above
F) A) and B)

Question 4

Mass spectrometry is an analytical technique used to determine the molecular masses, the molecular formulae, and the _____ of compounds.

Accepted Answer

A)   molecular radicals
B)   molecular structures
C)   functional groups
D)   solubilitiesE) All of the above
F) B) and C)

Question 5

Which of the following gives rise to a prominent M − 18 peak in the mass spectrum?

Accepted Answer

A)   hexane
B)   1-chloropentane
C)   1-pentanol
D)   3-methylpentaneE) A) and C)
F) None of the above

Question 6

What is the y-axis of a mass spectrum?

Accepted Answer

A)   mass
B)   energy
C)   abundance
D)   field strengthE) C) and D)
F) B) and D)

Question 7

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

Accepted Answer

The answer of Alpha cleavage of the following compound will...

Question 8

Which of the following sets of molecular ions does a dibromoalkane possess?

Accepted Answer

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 unitsE) B) and D)
F) B) and C)

Question 9

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) All of the above
F) B) and D)

Question 10

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?

Accepted Answer

A)   5
B)   6
C)   11
D)   12E) A) and C)
F) A) and B)

Question 11

Which of the following gives rise to a prominent M − 18 peak in the mass spectrum?

Accepted Answer

A)   cyclohexane
B)   cyclohexene
C)   1-chlorocyclohexane
D)   cyclohexanolE) None of the above
F) All of the above

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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

Question 14

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) All of the above
F) None of the above

Question 15

Provide the mass of the three most prominent fragment peaks that are observed in the EI mass spectrum of 2-hexanone, CH3CH2CH2CH2COCH3 (molecular ion m/z = 100) and describe the processes that lead to each of these fragments.

Accepted Answer

85: loss of CH₃• (15) by α-clea...

Question 16

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 17

Which of the following alcohols does not give a prominent M − 15 ion?

Accepted Answer

A)   isopropyl alcohol
B)   tert-butyl alcohol
C)   2-hexanol
D)   3-pentanolE) B) and C)
F) All of the above

Question 18

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.

Accepted Answer

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

Question 19

What is the principle that allows us to use mass spectrometry to determine the molecular weight of a compound?

Accepted Answer

A)   higher molecular weight compounds are less volatile
B)   higher molecular weight compounds are more dense
C)   a beam of higher molecular weight cations is deflected less by a magnetic field
D)   ions with higher molecular weight absorb higher frequencies of lightE) All of the above
F) None of the above

Question 20

The mass of the larger charged fragment produced by the dehydration of the following compound occurs at a m/z of _______. $\quad$$\mathrm{CH}_{3} \quad\mathrm{CH}_{3}$
$\quad$$\quad$|$\quad$$\quad$ |
$\mathrm{CH}_{3} \mathrm{CCH}_{2} \mathrm{CHCH}_{2} \mathrm{CH}_{2} \mathrm{OH}$
$\quad$$\quad$|
$\quad$$\mathrm{CH}_{3}$

Accepted Answer

The answer of The mass of the larger charged fragment...

Exam 14: Mass Spectrometry

Provide the mass of the three most prominent fragment peaks that are observed in the EI mass spectrum of 2-hexanone, CH₃CH₂CH₂CH₂COCH₃ (molecular ion m/z = 100) and describe the processes that lead to each of these fragments.

Correct Answer
verified
85: loss of CH₃• (15) by α-clea...
View Answer

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

Correct Answer
verified

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?

Correct Answer
verified

What is the y-axis of a mass spectrum?

Correct Answer
verified

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
verified

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 41?

Correct Answer
verified

What is the principle that allows us to use mass spectrometry to determine the molecular weight of a compound?

Correct Answer
verified

Which of the following gives rise to a prominent M − 18 peak in the mass spectrum?

Correct Answer
verified

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

Correct Answer
verified

Which of the following alcohols does not give a prominent M − 15 ion?

Correct Answer
verified

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

Correct Answer
verified

Which of the following gives rise to a prominent M − 18 peak in the mass spectrum?

Correct Answer
verified

Which of the following is most consistent with a molecule having a molecular ion with m/e of 77?

Correct Answer
verified

Mass spectrometry is an analytical technique used to determine the molecular masses, the molecular formulae, and the _____ of compounds.

Correct Answer
verified

Correct Answer
verified

Which of the following sets of molecular ions does a dibromoalkane possess?

Correct Answer
verified

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 43?

Correct Answer
verified

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
verified

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

Correct Answer
verified

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.

Correct Answer
verified

Exam 14: Mass Spectrometry

Provide the mass of the three most prominent fragment peaks that are observed in the EI mass spectrum of 2-hexanone, CH3CH2CH2CH2COCH3 (molecular ion m/z = 100) and describe the processes that lead to each of these fragments.

Correct Answerverified85: loss of CH3• (15) by α-clea...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

What is the y-axis of a mass spectrum?

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 gives rise to a prominent peak in the mass spectrum with m/z of 41?

Correct AnswerverifiedShow Answer

What is the principle that allows us to use mass spectrometry to determine the molecular weight of a compound?

Correct AnswerverifiedShow Answer

Which of the following gives rise to a prominent M − 18 peak in the mass spectrum?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following alcohols does not give a prominent M − 15 ion?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following gives rise to a prominent M − 18 peak in the mass spectrum?

Correct AnswerverifiedShow Answer

Which of the following is most consistent with a molecule having a molecular ion with m/e of 77?

Correct AnswerverifiedShow Answer

Mass spectrometry is an analytical technique used to determine the molecular masses, the molecular formulae, and the _____ of compounds.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following sets of molecular ions does a dibromoalkane possess?

Correct AnswerverifiedShow Answer

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 43?

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 AnswerverifiedShow Answer

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

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 base peak.

Correct AnswerverifiedShow Answer

Provide the mass of the three most prominent fragment peaks that are observed in the EI mass spectrum of 2-hexanone, CH₃CH₂CH₂CH₂COCH₃ (molecular ion m/z = 100) and describe the processes that lead to each of these fragments.

Correct Answer
verified
85: loss of CH₃• (15) by α-clea...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

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
verified

Correct Answer
verified

Correct Answer
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