Question 1

The separation of ions in the mass spectrometer is done by their ______.

Accepted Answer

A)  electrons to protons ratio 
B)  mass to neutrons ratio 
C)  protons to neutrons ratio 
D)  mass to charge ratio 
E)  protons to electrons ratio 
A)  electrons to protons ratio 
B)  mass to neutrons ratio 
C)  protons to neutrons ratio 
D)  mass to charge ratio 
E)  protons to electrons ratio

Question 2

GC-mass spectrometry is used to find the _________ of each compound in a __________.

Accepted Answer

A)  molecular formula, mixture of alkanes 
B)  molecular weight, mixture of compounds 
C)  molecular formula, mixture of compounds 
D)  B and C 
E)  none of these 
A)  molecular formula, mixture of alkanes 
B)  molecular weight, mixture of compounds 
C)  molecular formula, mixture of compounds 
D)  B and C 
E)  none of these

Question 3

Which one of the following compounds is consistent with the following IR spectrum?   SDBS: National Institute of Advanced Industrial Science and Technology

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 4

A compound with molecular formula C3H9N, shows absorptions at 3400 cm-1 (two), 2980 cm-1 and at 1100 cm-1 on the IR spectrum. Propose a possible structure for this compound.

Accepted Answer

CH₃CH₂CH₂NH₂ O

Question 5

High-resolution mass spectrometry is used to determine the _____ of a compound.

Accepted Answer

A)  degree of unsaturation 
B)  molecular formula 
C)  molecular weight 
D)  B and C 
E)  none of these 
A)  degree of unsaturation 
B)  molecular formula 
C)  molecular weight 
D)  B and C 
E)  none of these

Question 6

For each of the following IR spectra determine if it is consistent with the structure of an alcohol, a ketone, an aldehyde, a carboxylic acid, a primary amine or a secondary amine.
I.   SDBS: National Institute of Advanced Industrial Science and Technology
II.   SDBS: National Institute of Advanced Industrial Science and Technology

Accepted Answer

I: aldehyd

Question 7

Propose a possible structure for a compound with molecular formula C6H5Br.

Accepted Answer

@#IMG-DLM&_TB4454_00

Question 8

Arrange the following electromagnetic radiation in decreasing (highest to lowest) order of wavelength.

Accepted Answer

A)  V > III > IV > II > I 
B)  II > V > III > IV > I 
C)  I > IV > III > V > II 
D)  V > II > IV > III > I 
E)  II > IV > V > III > I 
A)  V > III > IV > II > I 
B)  II > V > III > IV > I 
C)  I > IV > III > V > II 
D)  V > II > IV > III > I 
E)  II > IV > V > III > I

Question 9

Diluted alcohols show a _____absorption around 3600 cm-1, due to _____.

Accepted Answer

A)  sharp, hydrogen bonding 
B)  broad, hydrogen bonding 
C)  sharp, absence of hydrogen bonding 
D)  broad, absence of hydrogen bonding 
A)  sharp, hydrogen bonding 
B)  broad, hydrogen bonding 
C)  sharp, absence of hydrogen bonding 
D)  broad, absence of hydrogen bonding

Question 10

Which of the following is true about CH3CH3+•?

Accepted Answer

A)  it is the parent ion of ethane 
B)  it is a molecular ion of ethane with m/z = 30 
C)  it is a fragment of propane 
D)  it is a fragment of butane 
E)  A and B 
A)  it is the parent ion of ethane 
B)  it is a molecular ion of ethane with m/z = 30 
C)  it is a fragment of propane 
D)  it is a fragment of butane 
E)  A and B

Question 11

How will you distinguish between the following compounds using high-resolution mass spectrometry?

Accepted Answer

Compound I: m/z at 1

Question 12

Which one of the following compounds is consistent with the following IR spectrum?   SDBS: National Institute of Advanced Industrial Science and Technology

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 13

Provide the structure of the major fragment that results when the molecular ion of (CH3)2CHCH2CH2NH2 undergoes fragmentation.

Accepted Answer

Question 14

Predict the product for the following reaction and explain how you can use IR spectroscopy to monitor the progress of the reaction.

Accepted Answer

CH₃CH₂CH₂C≡CCH₂CH₂CH₃ Absorptions fo

Question 15

For the following reaction, explain how you can use IR spectroscopy to monitor the progress of the reaction.

Accepted Answer

The two absorptions at 3350 cm

Question 16

Propose all possible structures for a compound with molecular formula C4H9N that shows two medium absorptions at 3400 cm-1 and no absorption in the range of 1600 - 1800 cm-1 in its IR spectrum.

Accepted Answer

Question 17

Which of the following wavenumber corresponds to the carbon/carbon triple bond region on an IR spectrum?

Accepted Answer

A)  1500 - 4000 cm-1 
B)  400 - 4000 cm-1 
C)  400 - 1500 cm-1 
D)  2100 - 2300 cm-1 
E)  1600 - 1850 cm-1 
A)  1500 - 4000 cm-1 
B)  400 - 4000 cm-1 
C)  400 - 1500 cm-1 
D)  2100 - 2300 cm-1 
E)  1600 - 1850 cm-1

Question 18

A compound with molecular formula C6H10O, shows absorptions at 1720 cm-1 and at 2980 cm-1 on the IR spectrum. Propose a possible structure for this compound.

Accepted Answer

Question 19

Which of the following is currently most often used to indicate the location of a signal on an IR spectrum?

Accepted Answer

A)  wavelength 
B)  wavenumber 
C)  frequency 
D)  A and B 
E)  all of these 
A)  wavelength 
B)  wavenumber 
C)  frequency 
D)  A and B 
E)  all of these

Question 20

Which of the following compounds will have absorptions at 1700 cm-1 and 1320 cm-1?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Exam 14: Infrared Spectroscopy and Mass Spectrometry

The separation of ions in the mass spectrometer is done by their ______.

GC-mass spectrometry is used to find the _________ of each compound in a __________.

Which one of the following compounds is consistent with the following IR spectrum? SDBS: National Institute of Advanced Industrial Science and Technology

A compound with molecular formula C3H9N, shows absorptions at 3400 cm-1 (two), 2980 cm-1 and at 1100 cm-1 on the IR spectrum. Propose a possible structure for this compound.

High-resolution mass spectrometry is used to determine the _____ of a compound.

Propose a possible structure for a compound with molecular formula C6H5Br.

Arrange the following electromagnetic radiation in decreasing (highest to lowest) order of wavelength.

Diluted alcohols show a _____absorption around 3600 cm-1, due to _____.

Which of the following is true about CH3CH3+•?

How will you distinguish between the following compounds using high-resolution mass spectrometry?

Which one of the following compounds is consistent with the following IR spectrum? SDBS: National Institute of Advanced Industrial Science and Technology

Provide the structure of the major fragment that results when the molecular ion of (CH3)2CHCH2CH2NH2 undergoes fragmentation.

Predict the product for the following reaction and explain how you can use IR spectroscopy to monitor the progress of the reaction.

For the following reaction, explain how you can use IR spectroscopy to monitor the progress of the reaction.

Propose all possible structures for a compound with molecular formula C4H9N that shows two medium absorptions at 3400 cm-1 and no absorption in the range of 1600 - 1800 cm-1 in its IR spectrum.

Which of the following wavenumber corresponds to the carbon/carbon triple bond region on an IR spectrum?

A compound with molecular formula C6H10O, shows absorptions at 1720 cm-1 and at 2980 cm-1 on the IR spectrum. Propose a possible structure for this compound.

Which of the following is currently most often used to indicate the location of a signal on an IR spectrum?

Which of the following compounds will have absorptions at 1700 cm-1 and 1320 cm-1?

A Review of General Chemistry: Electrons, Bonds, and Molecular Properties

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Chemical Reactivity and Mechanisms

Alkyl Halides: Nucleophilic Substitution and Elimination Reactions

Addition Reactions of Alkenes

Alkynes

Radical Reactions

Synthesis

Alcohols and Phenols

Ethers and Epoxides; Thiols and Sulfides

Nuclear Magnetic Resonance Spectroscopy

Conjugated Pi Systems and Pericyclic Reactions

Aromatic Compounds

Aromatic Substitution Reactions

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Alpha Carbon Chemistry: Enols and Enolates

Amines

Introduction to Organometallic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

GC-mass spectrometry is used to find the _ of each compound in a __.

A compound with molecular formula C₃H₉N, shows absorptions at 3400 cm^-1 (two), 2980 cm^-1 and at 1100 cm^-1 on the IR spectrum. Propose a possible structure for this compound.

Propose a possible structure for a compound with molecular formula C₆H₅Br.

Diluted alcohols show a _absorption around 3600 cm^-1, due to _.

Which of the following is true about CH₃CH₃⁺•?

Provide the structure of the major fragment that results when the molecular ion of (CH₃)₂CHCH₂CH₂NH₂ undergoes fragmentation.

Propose all possible structures for a compound with molecular formula C₄H₉N that shows two medium absorptions at 3400 cm^-1 and no absorption in the range of 1600 - 1800 cm^-1 in its IR spectrum.

A compound with molecular formula C₆H₁₀O, shows absorptions at 1720 cm^-1 and at 2980 cm^-1 on the IR spectrum. Propose a possible structure for this compound.

Which of the following compounds will have absorptions at 1700 cm^-1 and 1320 cm^-1?