Exam 12: Infrared Spectroscopy and Mass Spectrometry

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If the mass spectrum of chlorobenzene shows a peak with an m/z value of 114, having an abundance of 15%, calculate the m/z value and approximate abundance of the molecular ion peak.

(Short Answer)

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Question 21

An ________ molecular ion peak usually indicates the presence of an odd number of nitrogen atoms in the molecule.

(Multiple Choice)

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Question 22

Which compound would you expect to see a broad absorption with two spikes around 3300 cm^-1 and a strong absorption at 1640 cm^-1?

(Multiple Choice)

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Question 23

Which of the following equations is equal to frequency?

(Multiple Choice)

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Question 24

Which compound would be expected to show intense IR absorption at 2200 cm^-1?

(Multiple Choice)

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Question 25

What compound has a significant m/z 70 in its mass spectrum?

(Multiple Choice)

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Question 26

Absorption of what type of electromagnetic radiation results in transitions among allowed rotational motions?

(Multiple Choice)

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Question 27

The natural abundances of chlorine's two major isotopes are ³⁵Cl (75.5%) and ³⁷Cl (24.5%). If the mass spectrum of chlorobenzene contains a peak at m/z 114 with an abundance of 15.0%, calculate the percent abundance of the peak at m/z 112.

(Short Answer)

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Question 28

Rank the following bonds in order of increasing stretching frequency (cm^-1) in IR spectroscopy:

(Essay)

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Question 29

Which region of the electromagnetic spectrum, IR or X-ray, is characterized by waves of lower frequency?

(Short Answer)

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Question 30

How could IR spectroscopy be used to distinguish between the following pair of compounds? HOCH₂CH₂CHO and CH₃CH₂CO₂H

(Essay)

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Question 31

Which of the following molecules has a characteristic stretch at 2200 cm^-1?

(Multiple Choice)

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Question 32

Deduce a possible structure for the compound with the IR absorptions below. C₃H₅N: 2950, 2250 cm^-1

(Short Answer)

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Question 33

3-Pentanol can be oxidized to 3-pentanone using sodium dichromate. How can the completeness of conversion be gauged using IR spectroscopy?

(Essay)

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Question 34

In a mass spectrum, the peak of greatest abundance is referred to as the ________.

(Short Answer)

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Question 35

Which compound has an IR absorption with a broad peak and a single spike at 3300 cm^-1?

(Multiple Choice)

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Question 36

Which of the following molecules has a characteristic stretch at 1750 cm^-1?

(Multiple Choice)

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Question 37

The mass spectrum of which compound has an M+2 peak that has intensity that is about 4% of its M⁺ peak?

(Multiple Choice)

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Question 38

An infrared wavelength of 4.48μm is equivalent to a wavenumber of ________ cm^-1.

(Short Answer)

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Question 39

Which compound would be expected to show intense IR absorption at 1715 cm^-1?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 121

Exam 12: Infrared Spectroscopy and Mass Spectrometry

If the mass spectrum of chlorobenzene shows a peak with an m/z value of 114, having an abundance of 15%, calculate the m/z value and approximate abundance of the molecular ion peak.

An ________ molecular ion peak usually indicates the presence of an odd number of nitrogen atoms in the molecule.

Which compound would you expect to see a broad absorption with two spikes around 3300 cm-1 and a strong absorption at 1640 cm-1?

Which of the following equations is equal to frequency?

Which compound would be expected to show intense IR absorption at 2200 cm-1?

What compound has a significant m/z 70 in its mass spectrum?

Absorption of what type of electromagnetic radiation results in transitions among allowed rotational motions?

The natural abundances of chlorine's two major isotopes are 35Cl (75.5%) and 37Cl (24.5%). If the mass spectrum of chlorobenzene contains a peak at m/z 114 with an abundance of 15.0%, calculate the percent abundance of the peak at m/z 112.

Rank the following bonds in order of increasing stretching frequency (cm-1) in IR spectroscopy:

Which region of the electromagnetic spectrum, IR or X-ray, is characterized by waves of lower frequency?

How could IR spectroscopy be used to distinguish between the following pair of compounds? HOCH2CH2CHO and CH3CH2CO2H

Which of the following molecules has a characteristic stretch at 2200 cm-1?

Deduce a possible structure for the compound with the IR absorptions below. C3H5N: 2950, 2250 cm-1

3-Pentanol can be oxidized to 3-pentanone using sodium dichromate. How can the completeness of conversion be gauged using IR spectroscopy?

In a mass spectrum, the peak of greatest abundance is referred to as the ________.

Which compound has an IR absorption with a broad peak and a single spike at 3300 cm-1?

Which of the following molecules has a characteristic stretch at 1750 cm-1?

The mass spectrum of which compound has an M+2 peak that has intensity that is about 4% of its M+ peak?

An infrared wavelength of 4.48μm is equivalent to a wavenumber of ________ cm-1.

Which compound would be expected to show intense IR absorption at 1715 cm-1?

Structure and Bonding

Acids and Bases; Functional Groups

Structure and Stereochemistry of Alkanes

The Study of Chemical Reactions

Stereochemistry

Alkyl Halides; Nucleophilic Substitution

Structure and Synthesis of Alkenes; Elimination

Reactions of Alkenes

Structure and Synthesis of Alcohols

Reactions of Alcohols

Nuclear Magnetic Resonance Spectroscopy

Ethers, Epoxides, and Thioethers

Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy

Aromatic Compounds

Reactions of Aromatic Compounds

Ketones and Aldehydes

Amines

Carboxylic Acids

Carboxylic Acid Derivatives

Condensations and Alpha Substitutions of Carboxyl Compounds

Carbohydrates and Nucleic Acids

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

Which compound would you expect to see a broad absorption with two spikes around 3300 cm^-1 and a strong absorption at 1640 cm^-1?

Which compound would be expected to show intense IR absorption at 2200 cm^-1?

The natural abundances of chlorine's two major isotopes are ³⁵Cl (75.5%) and ³⁷Cl (24.5%). If the mass spectrum of chlorobenzene contains a peak at m/z 114 with an abundance of 15.0%, calculate the percent abundance of the peak at m/z 112.

Rank the following bonds in order of increasing stretching frequency (cm^-1) in IR spectroscopy:

How could IR spectroscopy be used to distinguish between the following pair of compounds? HOCH₂CH₂CHO and CH₃CH₂CO₂H

Which of the following molecules has a characteristic stretch at 2200 cm^-1?

Deduce a possible structure for the compound with the IR absorptions below. C₃H₅N: 2950, 2250 cm^-1

Which compound has an IR absorption with a broad peak and a single spike at 3300 cm^-1?

Which of the following molecules has a characteristic stretch at 1750 cm^-1?

The mass spectrum of which compound has an M+2 peak that has intensity that is about 4% of its M⁺ peak?

An infrared wavelength of 4.48μm is equivalent to a wavenumber of ________ cm^-1.

Which compound would be expected to show intense IR absorption at 1715 cm^-1?