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

A compound with the molecular formula C10H13Cl gave the following 1H NMR spectrum: singlet,$\delta$ 1.6 Singlet,$\delta$ 3.1 Multiplet,$\delta$ 7.2 (5H) The most likely structure for the compound is:

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

How many signals will be recorded in the broadband proton-decoupled 13C spectrum of 4-chloro-1-ethylbenzene?

A) 2 B) 3 C) 4 D) 6 E) 7 A) 2 B) 3 C) 4 D) 6 E) 7

Exam 9: Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

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 61

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

(Multiple Choice)

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Question 62

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 63

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 64

A mass spectrometer sorts ions on the basis of their _______________.

(Short Answer)

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Question 65

In electron impact mass spectrometry,a beam of high-energy electrons initially dislodges one electron from the compound being studied.This produces a positively charged ion called the ____________________.

(Short Answer)

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Question 66

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 67

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 68

A compound with the molecular formula C₈H₉ClO gave the following ¹H NMR spectrum: triplet, $\delta$ 3.7 Triplet, $\delta$ 4.2 Multiplet $\delta$ 7.1 There was no evidence of an -OH band in the IR spectrum.The most likely structure for the compound is: $A compound with the molecular formula C8H9ClO gave the following 1H NMR spectrum: triplet, \delta 3.7 Triplet, \delta 4.2 Multiplet \delta 7.1 There was no evidence of an -OH band in the IR spectrum.The most likely structure for the compound is:$

(Multiple Choice)

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Question 69

A compound with the molecular formula C₈H₉BrO gave the following ¹H NMR spectrum: triplet, $\delta$ 1.4 Quartet, $\delta$ 3.9 Multiplet, $\delta$ 7.0 (4H) There was no evidence of an -OH band in the IR spectrum.A possible structure for the compound is: $A compound with the molecular formula C8H9BrO gave the following 1H NMR spectrum: triplet, \delta 1.4 Quartet, \delta 3.9 Multiplet, \delta 7.0 (4H) There was no evidence of an -OH band in the IR spectrum.A possible structure for the compound is:$

(Multiple Choice)

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Question 70

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₁₀H₁₁N? Looking at the ¹³C-NMR you notice 10 distinct peaks,and the IR has a characteristic peak around 2250 cm^-1.Relative integration is shown.

(Multiple Choice)

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Question 71

The ¹H NMR spectrum of which of these compounds would consist of a triplet,singlet and quartet only?

(Multiple Choice)

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Question 72

Predict the splitting pattern you would observe for the proton at C3 of 2,3-dimethyl-2-phenylbutane.

(Multiple Choice)

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Question 73

A compound C₅H₁₀O gave the following spectral data: ¹H NMR spectrum IR spectrum Doublet, $\delta$ 1.10 strong peak Singlet, $\delta$ 2.10 near 1720 cm^-1 Septet, $\delta$ 2.50 Which is a reasonable structure for the compound? $A compound C5H10O gave the following spectral data: 1H NMR spectrum IR spectrum Doublet, \delta 1.10 strong peak Singlet, \delta 2.10 near 1720 cm-1 Septet, \delta 2.50 Which is a reasonable structure for the compound?$

(Multiple Choice)

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Question 74

A compound with the molecular formula C₁₀H₁₃Cl gave the following ¹H NMR spectrum: singlet, $\delta$ 1.6 Singlet, $\delta$ 3.1 Multiplet, $\delta$ 7.2 (5H) The most likely structure for the compound is: $A compound with the molecular formula C10H13Cl gave the following 1H NMR spectrum: singlet, \delta 1.6 Singlet, \delta 3.1 Multiplet, \delta 7.2 (5H) The most likely structure for the compound is:$

(Multiple Choice)

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Question 75

What is the nitrogen rule?

(Essay)

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Question 76

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₁₀H₁₂O₂? Relative integration is shown.

(Multiple Choice)

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Question 77

How many signals will be recorded in the broadband proton-decoupled ¹³C spectrum of 4-chloro-1-ethylbenzene?

(Multiple Choice)

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Question 78

Consider the expected splitting of signal "b" in the ¹H NMR spectrum of 1-methoxy-2-methylpropane,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 79

What can be determined from the relative abundance of the M ⁺ _$\bullet$ +1 peak?

(Essay)

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Question 80

Showing 61 - 80 of 94

Exam 9: Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

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

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 C5H11NO? In the 13C-NMR spectrum you notice that the farthest peak downfield has a chemical shift of 173 ppm.Relative integration is shown.

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

A mass spectrometer sorts ions on the basis of their _______________.

In electron impact mass spectrometry,a beam of high-energy electrons initially dislodges one electron from the compound being studied.This produces a positively charged ion called the ____________________.

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

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

A compound with the molecular formula C8H9ClO gave the following 1H NMR spectrum: triplet, δ\deltaδ 3.7 Triplet, δ\deltaδ 4.2 Multiplet δ\deltaδ 7.1 There was no evidence of an -OH band in the IR spectrum.The most likely structure for the compound is:

A compound with the molecular formula C8H9BrO gave the following 1H NMR spectrum: triplet, δ\deltaδ 1.4 Quartet, δ\deltaδ 3.9 Multiplet, δ\deltaδ 7.0 (4H) There was no evidence of an -OH band in the IR spectrum.A possible structure for the compound is:

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C10H11N? Looking at the 13C-NMR you notice 10 distinct peaks,and the IR has a characteristic peak around 2250 cm-1.Relative integration is shown.

The 1H NMR spectrum of which of these compounds would consist of a triplet,singlet and quartet only?

Predict the splitting pattern you would observe for the proton at C3 of 2,3-dimethyl-2-phenylbutane.

A compound C5H10O gave the following spectral data: 1H NMR spectrum IR spectrum Doublet, δ\deltaδ 1.10 strong peak Singlet, δ\deltaδ 2.10 near 1720 cm-1 Septet, δ\deltaδ 2.50 Which is a reasonable structure for the compound?

A compound with the molecular formula C10H13Cl gave the following 1H NMR spectrum: singlet, δ\deltaδ 1.6 Singlet, δ\deltaδ 3.1 Multiplet, δ\deltaδ 7.2 (5H) The most likely structure for the compound is:

What is the nitrogen rule?

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C10H12O2? Relative integration is shown.

How many signals will be recorded in the broadband proton-decoupled 13C spectrum of 4-chloro-1-ethylbenzene?

Consider the expected splitting of signal "b" in the 1H NMR spectrum of 1-methoxy-2-methylpropane,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"?

What can be determined from the relative abundance of the M + ∙\bullet∙ +1 peak?

Carbon Compounds and Chemical Bonds

Representative Carbon Compounds: Functional Groups, Intermolecular Forces, and Infrared Ir Spectroscopy

An Introduction to Organic Reactions: Acids and Bases

Alkanes: Nomenclature, Conformational Analysis, and an Introduction to Synthesis

Stereochemistry: Chiral Molecules

Ionic Reactions - Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Alkenes and Alkynes Ii: Addition Reactions

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones I Nucleophilic Addition to the Carbonyl Group

Aldehydes and Ketones Ii Aldol Reactions

Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Synthesis and Reactions of Beta-Dicarbonyl Compounds: More Chemistry of Enolate Ions

Amines

Phenols and Aryl Halides: Nucleophilic Aromatic Substitution

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

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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 C₅H₁₁NO? In the ¹³C-NMR spectrum you notice that the farthest peak downfield has a chemical shift of 173 ppm.Relative integration is shown.

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

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₁₀H₁₁N? Looking at the ¹³C-NMR you notice 10 distinct peaks,and the IR has a characteristic peak around 2250 cm^-1.Relative integration is shown.

The ¹H NMR spectrum of which of these compounds would consist of a triplet,singlet and quartet only?

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₁₀H₁₂O₂? Relative integration is shown.

How many signals will be recorded in the broadband proton-decoupled ¹³C spectrum of 4-chloro-1-ethylbenzene?

Consider the expected splitting of signal "b" in the ¹H NMR spectrum of 1-methoxy-2-methylpropane,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"?

What can be determined from the relative abundance of the M ⁺ _$\bullet$ +1 peak?