How many 13C signals would 1,2-dimethylbenzene give?

A) 1 B) 2 C) 3 D) 4 E) 5 A) 1 B) 2 C) 3 D) 4 E) 5

How many 13C signals would 1,4-dimethylbenzene give?

A) 1 B) 2 C) 3 D) 4 E) 5 A) 1 B) 2 C) 3 D) 4 E) 5

How many 1H NMR signals would cis-1,2-dichlorocyclopropane give?

A) 1 B) 2 C) 3 D) 4 E) 5 A) 1 B) 2 C) 3 D) 4 E) 5

Exam 9: Nuclear Magnetic Resonance and Mass Spectrometry

Consider the expected splitting of the C2 proton signal in the ¹H NMR spectrum of 2-ethyl-1,3-propanediol.Presuming that the coupling constants for neighboring protons are sufficiently different,and that the instrument has sufficient resolving power,what is the theoretical multiplicity of the C2 proton signal?

(Multiple Choice)

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Question 101

Briefly explain how you might distinguish between the following substances by comparing their ¹H-NMR spectra:

(Essay)

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Question 102

For the following compound how many different signals would you see in the proton NMR? (Assume that you can see them all.)

(Multiple Choice)

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Question 103

Consider the expected splitting of signal "b" in the ¹H NMR spectrum of 1,1-dichloro-3-methylbutane,shown below.Presuming that J_ab is sufficiently different from J_bc and that the instrument has sufficient resolving power,what is the theoretical multiplicity of signal "b"?

(Multiple Choice)

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Question 104

A compound with the molecular formula C₆H₁₅N gave the following ¹H NMR spectrum: triplet, $\delta$ 0 0.90 Quartet, $\delta$ 2.4 There were no other signals.The most likely structure for the compound is:

(Multiple Choice)

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Question 105

Which form of electromagnetic radiation possesses the least energy?

(Short Answer)

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Question 106

Consider the expected splitting of signal "c" in the ¹H NMR spectrum of 2-ethyl-1-butanol,shown below.Presuming that J_bc is sufficiently different from J_cd and that the instrument has sufficient resolving power,what is the theoretical multiplicity of signal "c"?

(Multiple Choice)

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Question 107

An acceptable solvent to use for a deuterium exchange experiment with an alcohol would be CDCl₃.

(True/False)

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Question 108

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₆H₁₂O which shows no characteristic stretches in the IR between 3600-3300 cm^-1,but does around 1600 cm^-1? Relative integration is shown.

(Multiple Choice)

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Question 109

For the compound adamantine,how many different signals would you see in the proton NMR? (Assume that you can see them all.)

(Multiple Choice)

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Question 110

In the structure shown,H_b and H_c are classified as:

(Multiple Choice)

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Question 111

For the following compound how many different signals would you see in the carbon NMR? (Assume that you can see them all.)

(Multiple Choice)

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Question 112

An unknown compound,F,has the formula C₃H₆O₂.Elucidate the structure of F by scrutinizing its IR,¹H NMR and ¹³C NMR spectra,shown below.

(Essay)

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Question 113

How many ¹³C signals would 1,2-dimethylbenzene give?

(Multiple Choice)

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Question 114

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₈H₁₄? Relative integration is shown.

(Multiple Choice)

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Question 115

How many ¹³C signals would 1,4-dimethylbenzene give?

(Multiple Choice)

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Question 116

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₅H₁₁NO? In the ¹³C-NMR spectrum you notice that the farthest peak downfield has a chemical shift of 173 ppm.Relative integration is shown.

(Multiple Choice)

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Question 117

Predict the splitting pattern you would observe for the proton at C1 of 2,3-dimethyl-2-phenylbutane.

(Multiple Choice)

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Question 118

How many ¹H NMR signals would cis-1,2-dichlorocyclopropane give?

(Multiple Choice)

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Question 119

Which one of the following best represents the predicted approximate chemical shift and coupling for the hydrogen(s)indicated with the arrow?

(Multiple Choice)

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Question 120

Showing 101 - 120 of 158

Exam 9: Nuclear Magnetic Resonance and Mass Spectrometry

Briefly explain how you might distinguish between the following substances by comparing their 1H-NMR spectra:

For the following compound how many different signals would you see in the proton NMR? (Assume that you can see them all.)

Consider the expected splitting of signal "b" in the 1H NMR spectrum of 1,1-dichloro-3-methylbutane,shown below.Presuming that Jab is sufficiently different from Jbc and that the instrument has sufficient resolving power,what is the theoretical multiplicity of signal "b"?

A compound with the molecular formula C6H15N gave the following 1H NMR spectrum: triplet, δ\deltaδ 0 0.90 Quartet, δ\deltaδ 2.4 There were no other signals.The most likely structure for the compound is:

Which form of electromagnetic radiation possesses the least energy?

Consider the expected splitting of signal "c" in the 1H NMR spectrum of 2-ethyl-1-butanol,shown below.Presuming that Jbc is sufficiently different from Jcd and that the instrument has sufficient resolving power,what is the theoretical multiplicity of signal "c"?

An acceptable solvent to use for a deuterium exchange experiment with an alcohol would be CDCl3.

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C6H12O which shows no characteristic stretches in the IR between 3600-3300 cm-1,but does around 1600 cm-1? Relative integration is shown.

For the compound adamantine,how many different signals would you see in the proton NMR? (Assume that you can see them all.)

In the structure shown,Hb and Hc are classified as:

For the following compound how many different signals would you see in the carbon NMR? (Assume that you can see them all.)

An unknown compound,F,has the formula C3H6O2.Elucidate the structure of F by scrutinizing its IR,1H NMR and 13C NMR spectra,shown below.

How many 13C signals would 1,2-dimethylbenzene give?

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C8H14? Relative integration is shown.

How many 13C signals would 1,4-dimethylbenzene give?

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C5H11NO? In the 13C-NMR spectrum you notice that the farthest peak downfield has a chemical shift of 173 ppm.Relative integration is shown.

Predict the splitting pattern you would observe for the proton at C1 of 2,3-dimethyl-2-phenylbutane.

How many 1H NMR signals would cis-1,2-dichlorocyclopropane give?

Which one of the following best represents the predicted approximate chemical shift and coupling for the hydrogen(s)indicated with the arrow?

The Basics

Families of Carbon

Acids and Bases

Nomenclature and Conformations of Alkanes and Cycloalkanes

Stereochemistry

Nucleophilic Reactions

Alkenes and Alkynes I

Alkenes and Alkynes II

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Reactions at the Α Carbon of Carbonyl Compounds

Condensation and Conjugate Addition Reactions of Carbonyl Compounds

Amines

Transition Metal Complexes

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

Briefly explain how you might distinguish between the following substances by comparing their ¹H-NMR spectra:

Consider the expected splitting of signal "b" in the ¹H NMR spectrum of 1,1-dichloro-3-methylbutane,shown below.Presuming that J_ab is sufficiently different from J_bc and that the instrument has sufficient resolving power,what is the theoretical multiplicity of signal "b"?

A compound with the molecular formula C₆H₁₅N gave the following ¹H NMR spectrum: triplet, $\delta$ 0 0.90 Quartet, $\delta$ 2.4 There were no other signals.The most likely structure for the compound is:

Consider the expected splitting of signal "c" in the ¹H NMR spectrum of 2-ethyl-1-butanol,shown below.Presuming that J_bc is sufficiently different from J_cd and that the instrument has sufficient resolving power,what is the theoretical multiplicity of signal "c"?

An acceptable solvent to use for a deuterium exchange experiment with an alcohol would be CDCl₃.

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₆H₁₂O which shows no characteristic stretches in the IR between 3600-3300 cm^-1,but does around 1600 cm^-1? Relative integration is shown.

In the structure shown,H_b and H_c are classified as:

An unknown compound,F,has the formula C₃H₆O₂.Elucidate the structure of F by scrutinizing its IR,¹H NMR and ¹³C NMR spectra,shown below.

How many ¹³C signals would 1,2-dimethylbenzene give?

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₈H₁₄? Relative integration is shown.

How many ¹³C signals would 1,4-dimethylbenzene give?

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₅H₁₁NO? In the ¹³C-NMR spectrum you notice that the farthest peak downfield has a chemical shift of 173 ppm.Relative integration is shown.

How many ¹H NMR signals would cis-1,2-dichlorocyclopropane give?