Question 1

Which of the following sets of molecular ions does an alkyl bromide 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) A) and D)
F) A) and C)

Question 2

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

Accepted Answer

A)   C6H12O2
B)   C7H10ClN
C)   C8H18N2
D)   C8H12E) All of the above
F) B) and C)

Question 3

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) A) and B)
F) A) and C)

Question 4

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.

Accepted Answer

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

Question 5

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) C) and D)

Question 6

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

Question 7

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

Accepted Answer

A)   CH4-  x + 2 e-
B)   CH3- + Hx
C)   CH4+x + 2 e-
D)   CH3x + H+ + 2 e-E) B) and C)
F) A) and B)

Question 8

What is the most likely moleuclar 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.

Accepted Answer

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

Question 9

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 10

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) B) and C)

Question 11

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) None of the above
F) All of the above

Question 12

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

Accepted Answer

A)   mass analysis by light-detected ions
B)   matrix assisted laser desorption ionization
C)   many atom loss-detecting ionization
D)   molecular and light detecting instrumentE) None of the above
F) B) and C)

Question 13

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) A) and B)
F) B) and C)

Question 14

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

Accepted Answer

A)   1-hexanamine, CH3CH2CH2CH2CH2CH2NH2
B)   1,1-dimethyl-1-butanamine, CH3CH2CH2C(CH3) 2NH2
C)   1-hexanol
D)   hexanalE) None of the above
F) B) and C)

Question 15

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

Question 16

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

Question 17

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

Accepted Answer

A)   1-hexanol
B)   2-hexanol
C)   hexanal
D)   hexanoic acidE) None of the above
F) A) and B)

Question 18

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 C)
F) A) and B)

Question 19

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 B)
F) A) and C)

Exam 14: Mass Spectrometry

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

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

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 alcohols does not give a prominent M - 15 ion?

Correct Answer
verified

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

Correct Answer
verified

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

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 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.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

What is the most likely moleuclar 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.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Which of the following sets of molecular ions does an alkyl bromide 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

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

Correct Answer
verified

Exam 14: Mass Spectrometry

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 at m/z of 39?

Correct AnswerverifiedShow Answer

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

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 alcohols does not give a prominent M - 15 ion?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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 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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the most likely moleuclar 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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following sets of molecular ions does an alkyl bromide 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

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

Correct AnswerverifiedShow Answer

Correct Answer
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