Question 1

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

Question 2

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− 
A)  CH4− ⋅ + 2 e− 
B)  CH3− + H⋅ 
C)  CH4+⋅ + 2 e− 
D)  CH3⋅ + H+ + 2 e− C

Question 3

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 III 
A)  Only I 
B)  Only II 
C)  Only I and II 
D)  Only II and III 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 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 5

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 acid 
A)  1-hexanol 
B)  2-hexanol 
C)  hexanal 
D)  hexanoic acid

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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 8

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-heptyne 
A)  1-octyne 
B)  4-octyne 
C)  5-methyl-3-octyne 
D)  2,2-dimethyl-3-heptyne

Question 9

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
  . 
A)  X is
  , and Y is
  . 
B)  X is
  , and Y is
  . 
C)  X is
  , and Y is
  . 
D)  X is
  , and Y is
  .

Question 10

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) 
  
A) 
  
B) 
  
C) 
  
D)

Question 11

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

Question 12

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

Accepted Answer

A) EI-MS 
B) FAB 
C) MALDI 
D) ESI-MS 
A) EI-MS 
B) FAB 
C) MALDI 
D) ESI-MS

Question 13

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) 
$\left[\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}\right]^{+}$ 
B) 
$\left[\mathrm{H}_{3} \mathrm{C}-\mathrm{NH}_{2}\right]^{+}$ 
C) 
$\left[\mathrm{H}_{2} \mathrm{C}=\mathrm{NH}_{2}\right]^{+}$ 
D) 
$\left[\mathrm{H}_{3} \mathrm{C}-\mathrm{CH}_{3}\right]^{+}$ 
A) 
$\left[\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}\right]^{+}$ 
B) 
$\left[\mathrm{H}_{3} \mathrm{C}-\mathrm{NH}_{2}\right]^{+}$ 
C) 
$\left[\mathrm{H}_{2} \mathrm{C}=\mathrm{NH}_{2}\right]^{+}$ 
D) 
$\left[\mathrm{H}_{3} \mathrm{C}-\mathrm{CH}_{3}\right]^{+}$

Question 14

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)  C8H14Br2 
A)  C6H12Cl2 
B)  C7H10N2 
C)  C8H13N 
D)  C8H14Br2

Question 15

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 16

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 17

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 − 12 
A)  M − 29 
B)  M − 18 
C)  M − 15 
D)  M − 12

Question 18

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-hexene 
A)  1-hexene 
B)  3-methyl-1-hexene 
C)  4-methyl-1-hexene 
D)  5-methyl-1-hexene

Question 19

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 20

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-MS 
A) EI-MS 
B) FAB 
C) MALDI 
D) ESI-MS

Exam 14: Mass Spectrometry

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

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

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

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

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

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.

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

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

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

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

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

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

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

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 __________.

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?

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

Covalent Bonding and Shapes of Molecules

Alkanes and Cycloalkanes

Stereoisomerism and Chirality

Acids and Bases

Alkenes: Bonding, Nomenclature, and Properties

Reactions of Alkenes

Alkynes

Haloalkanes, Halogenation, and Radical Reactions

Nucleophilic Substitution and Beta-Elimination

Alcohols

Ethers, Epoxides, and Sulfides

Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

An Introduction to Organometallic Compounds

Aldehydes and Ketones

Carboxylic Acids

Functional Derivatives of Carboxylic Acids

Enolate Anions and Enamines

Dienes, Conjugated Systems, and Pericyclic Reactions

Benzene and the Concept of Aromaticity

Reactions of Benzene and Its Derivatives

Amines

Catalytic Carbon-Carbon Bond Formation

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids

Organic Polymer Chemistry

Filters

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

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

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