Question 1

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 insertion 
A) electron injection 
B) electron impact 
C) energy initiated 
D) energy insertion

Question 2

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 3

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 4

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 5

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 molecule 
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 molecule

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 ion 
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 ion

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

Accepted Answer

Question 8

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 9

Which C5H12O compound give the following EI mass spectrum?

Accepted Answer

Question 10

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

Question 11

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 12

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 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 the following species.

Accepted Answer

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

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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 acid 
A) 2-methylhexanoic acid 
B) methyl hexanoate 
C) ethyl hexanoate 
D) hexanoic acid

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

Accepted Answer

A) cyclopentane 
B) cyclopentene 
C) cyclopentanol 
D) methylcyclopentane 
A) cyclopentane 
B) cyclopentene 
C) cyclopentanol 
D) methylcyclopentane

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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

Exam 14: Mass Spectrometry

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

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+.

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

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

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

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

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 ___________________.

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

Which C5H12O compound give the following EI mass spectrum?

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

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+.

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 _______.

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.

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

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

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.

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

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

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

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

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

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⁺.

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 ___________________.

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

Which C₅H₁₂O compound give the following EI mass spectrum?

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⁺.

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.

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