Exam 12: Infrared Spectroscopy and Mass Spectrometry

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What are the predicted m/z values (masses )and relative heights of all the molecular ions of 1-bromoethane that would appear on a mass spectrum (excluding peaks produced by ¹³C and²H)?

(Multiple Choice)

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Question 101

Sodium borohydride can be used to reduce cyclohexanone to cyclohexanol. How could one use IR to determine if all starting material had been consumed?

(Short Answer)

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Question 102

Which compound would be expected to show intense IR absorption at 1680 cm^-1?

(Short Answer)

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Question 103

How could IR spectroscopy be used to distinguish between the following pair of compounds? CH₃OCH₂CH₃ and CH₃CH₂CH₂OH

(Short Answer)

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Question 104

In what units are frequency values typically given?

(Essay)

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Question 105

Which has a lower characteristic stretching frequency, the C O bond or the CO bond? Explain briefly.

(Essay)

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Question 106

Which compound would be expected to show intense IR absorption at 2250 cm^-1?

(Multiple Choice)

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Question 107

Deduce a possible structure for the compound with the IR absorptions below. C₃H₃Br: 3300, 2900, 2100 cm^-1

(Short Answer)

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Question 108

At what m/z would the base peak of (E)-2-hexene occur?

(Multiple Choice)

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Question 109

Which compound would show a larger than usual M+2 peak in the mass spectrum?

(Multiple Choice)

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Question 110

In order for a vibration mode to be observable in the IR, the vibration must change the ________ of the molecule.

(Short Answer)

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Question 111

Which of the following compounds would contain characteristic IR stretches at 3300 and 2200 cm^-1?

(Multiple Choice)

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Question 112

Which of the following bonds, CN, C=N, or C꓿N, has an IR stretch around 1600 cm^-1?

(Short Answer)

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Question 113

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

(Short Answer)

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Question 114

Which of the following molecules has a characteristic broad stretch at 3300 cm^-1?

(Multiple Choice)

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Question 115

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 % abundance of the peak at m/z 112.

(Short Answer)

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Question 116

Which statement best explains why a carbonyl absorbs infrared radiation at a higher frequency than an alkene absorption?

(Multiple Choice)

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Question 117

Which of the following compounds has the lowest carbonyl stretching frequency?

(Essay)

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Question 118

Which of the following would not have a C-H stretch at about 3050 cm^-1?

(Multiple Choice)

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Question 119

In which units is frequency measured?

(Multiple Choice)

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Question 120

Showing 101 - 120 of 120

Exam 12: Infrared Spectroscopy and Mass Spectrometry

What are the predicted m/z values (masses )and relative heights of all the molecular ions of 1-bromoethane that would appear on a mass spectrum (excluding peaks produced by 13C and 2H)?

Sodium borohydride can be used to reduce cyclohexanone to cyclohexanol. How could one use IR to determine if all starting material had been consumed?

Which compound would be expected to show intense IR absorption at 1680 cm-1?

How could IR spectroscopy be used to distinguish between the following pair of compounds? CH3OCH2CH3 and CH3CH2CH2OH

In what units are frequency values typically given?

Which has a lower characteristic stretching frequency, the C O bond or the C­O bond? Explain briefly.

Which compound would be expected to show intense IR absorption at 2250 cm-1?

Deduce a possible structure for the compound with the IR absorptions below. C3H3Br: 3300, 2900, 2100 cm-1

At what m/z would the base peak of (E)-2-hexene occur?

Which compound would show a larger than usual M+2 peak in the mass spectrum?

In order for a vibration mode to be observable in the IR, the vibration must change the ________ of the molecule.

Which of the following compounds would contain characteristic IR stretches at 3300 and 2200 cm-1?

Which of the following bonds, C­N, C=N, or C꓿N, has an IR stretch around 1600 cm-1?

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

Which of the following molecules has a characteristic broad stretch at 3300 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 % abundance of the peak at m/z 112.

Which statement best explains why a carbonyl absorbs infrared radiation at a higher frequency than an alkene absorption?

Which of the following compounds has the lowest carbonyl stretching frequency?

Which of the following would not have a C-H stretch at about 3050 cm-1?

In which units is frequency measured?

Introduction and Review

Structure and Properties of Organic Molecules

Structure and Stereochemistry of Alkanes

The Study of Chemical Reactions

Stereochemistry

Alkyl Halides: Nucleophilic Substitution and Elimination

Structure and Synthesis of Alkenes

Reactions of Alkenes

Alkynes

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

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What are the predicted m/z values (masses )and relative heights of all the molecular ions of 1-bromoethane that would appear on a mass spectrum (excluding peaks produced by ¹³C and²H)?

Which compound would be expected to show intense IR absorption at 1680 cm^-1?

How could IR spectroscopy be used to distinguish between the following pair of compounds? CH₃OCH₂CH₃ and CH₃CH₂CH₂OH

Which has a lower characteristic stretching frequency, the C O bond or the CO bond? Explain briefly.

Which compound would be expected to show intense IR absorption at 2250 cm^-1?

Deduce a possible structure for the compound with the IR absorptions below. C₃H₃Br: 3300, 2900, 2100 cm^-1

Which of the following compounds would contain characteristic IR stretches at 3300 and 2200 cm^-1?

Which of the following bonds, CN, C=N, or C꓿N, has an IR stretch around 1600 cm^-1?

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

Which of the following molecules has a characteristic broad stretch at 3300 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 % abundance of the peak at m/z 112.

Which of the following would not have a C-H stretch at about 3050 cm^-1?