Question 1

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 91?

Accepted Answer

A)  1-octene 
B)  1-hexanamine, CH3CH2CH2CH2CH2CH2NH2 
C)  benzene 
D)  ethylbenzene 
A)  1-octene 
B)  1-hexanamine, CH3CH2CH2CH2CH2CH2NH2 
C)  benzene 
D)  ethylbenzene

Question 2

Which of the following sets of molecular ions does an alkyl chloride 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 units 
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 units

Question 3

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 instrument 
A)  mass analysis by light-detected ions 
B)  matrix assisted laser desorption ionization 
C)  many atom loss-detecting ionization 
D)  molecular and light detecting instrument

Question 4

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 5

Which C5H12O compound give the following EI mass spectrum?

Accepted Answer

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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 8

Which of the following is not prominent in the mass spectrum of 2-methyl-2-butanol?

Accepted Answer

A)  M − 15 
B)  M − 18 
C)  M − 21 
D)  M − 29 
A)  M − 15 
B)  M − 18 
C)  M − 21 
D)  M − 29

Question 9

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

Accepted Answer

A)  C6H12O2 
B)  C7H10ClN 
C)  C8H18N2 
D)  C8H12 
A)  C6H12O2 
B)  C7H10ClN 
C)  C8H18N2 
D)  C8H12

Question 10

Which C6H12O carbonyl-containing compound shows a molecular ion peak at m/z 100 and significant fragment peaks at m/z 71, 58, 57, 43 and 29 in the EI mass spectrum?

Accepted Answer

Question 11

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 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 peak at a m/z of _____ represents the following species. $\mathrm{CH}_{3} \stackrel{+}{\mathrm{C}} \mathrm{HCH}_{2} \mathrm{CH}_{3}$

Accepted Answer

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

Question 13

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

Accepted Answer

cyclohexen

Question 14

Identify a basic function of a mass spectrometer.

Accepted Answer

A)  It separates molecules according to their functional groups. 
B)  It measures only the abundance of isotopes present in molecules. 
C)  It converts neutral molecules into positively or negatively charged ions. 
D)  It separates ions according to their molecular masses. 
A)  It separates molecules according to their functional groups. 
B)  It measures only the abundance of isotopes present in molecules. 
C)  It converts neutral molecules into positively or negatively charged ions. 
D)  It separates ions according to their molecular masses.

Question 15

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

Exam 14: Mass Spectrometry

Which of the following gives rise to a prominent peak in the mass spectrum with m/z of 91?

Which of the following sets of molecular ions does an alkyl chloride possess?

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

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

Which C5H12O compound give the following EI mass spectrum?

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

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+.

Which of the following is not prominent in the mass spectrum of 2-methyl-2-butanol?

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

Which C6H12O carbonyl-containing compound shows a molecular ion peak at m/z 100 and significant fragment peaks at m/z 71, 58, 57, 43 and 29 in the EI 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/ -The peak at a m/z of _____ represents the following species. +CH2CH3

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

Identify a basic function of a mass spectrometer.

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

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

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⁺.

Which C₆H₁₂O carbonyl-containing compound shows a molecular ion peak at m/z 100 and significant fragment peaks at m/z 71, 58, 57, 43 and 29 in the EI 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/ -The peak at a m/z of _____ represents the following species. +CH₂CH₃

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