How many 13C signals would 1,3-dichlorobenzene give?

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

The 1H NMR spectrum of which of the compounds below,all of formula C7H12O2,would consist of two singlets only?

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

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

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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 21

Which proton(s)of the compound below would appear as a septet in the ¹H NMR spectrum?

(Multiple Choice)

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Question 22

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₁₁H₁₄O₂? Looking at the ¹³C-NMR you notice a peak at 174 ppm.Relative integration is shown.

(Multiple Choice)

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Question 23

What is the molecular formula of this compound? m/z Intensity 78 M ⁺ _$\bullet$ 10)00 79 1 80 3)3 81 0)3

(Multiple Choice)

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Question 24

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₅H₁₁NO,which shows a characteristic stretch in the IR around 1700 cm^-1,and a characteristic peak at 202 ppm in the ¹³C-NMR? Relative integration is shown.

(Multiple Choice)

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Question 25

The broadband proton-decoupled ¹³C NMR spectrum of a hexyl chloride exhibits five signals.Which of these structures could be the correct one for the compound?

(Multiple Choice)

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Question 26

Which form of electromagnetic radiation possesses the least energy?

(Short Answer)

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Question 27

How many ¹³C signals would 1,3-dichlorobenzene give?

(Multiple Choice)

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Question 28

Which proton(s)of the compound below would appear as a triplet in the ¹H NMR spectrum?

(Multiple Choice)

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Question 29

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

(Multiple Choice)

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Question 30

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₆H₁₀O₂? The ¹³C-NMR shows characteristic chemical shifts at 22.3,31.1,117.3,157.7,and 171.6 ppm.Relative integration is shown.

(Multiple Choice)

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Question 31

What compound is used as the standard "zero" reference in both carbon and proton NMR?

(Essay)

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Question 32

A shielded proton will absorb at a higher frequency (this is the end of the spectrum);and a deshielded proton will absorb at a lower frequency (the _____ end of the spectrum).

(Short Answer)

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Question 33

If all the protons of 1-fluoropentane could be discerned,which would you expect to be at the lowest field in the ¹H NMR spectrum of this compound?

(Multiple Choice)

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Question 34

A downfield ( $\delta$ 9-10)singlet is observed in the ¹H NMR spectrum of:

(Multiple Choice)

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Question 35

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₉H₁₈O₂ and characteristic ¹³C-NMR peaks at 11.3,21.6,25.3,49.4,67.1,and 175.5 ppm? Relative integration is shown.

(Multiple Choice)

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Question 36

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 37

The ¹H NMR spectrum of which of the compounds below,all of formula C₇H₁₂O₂,would consist of two singlets only?

(Multiple Choice)

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Question 38

An organic compound absorbs strongly in the IR at 1687 cm^-1.Its ¹H NMR spectrum consists of two signals,a singlet at 2.1 ppm and a multiplet centered at 7.1 ppm.Its mass spectrum shows significant peaks at m/z 120,m/z 105 and m/z 77.This information is consistent with which of the following structures?

(Multiple Choice)

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Question 39

Which of these compounds will not be represented by a singlet only in the ¹H NMR spectrum?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 94

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

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.

Which proton(s)of the compound below would appear as a septet in the 1H NMR spectrum?

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C11H14O2? Looking at the 13C-NMR you notice a peak at 174 ppm.Relative integration is shown.

What is the molecular formula of this compound? m/z Intensity 78 M + ∙\bullet∙ 10)00 79 1 80 3)3 81 0)3

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C5H11NO,which shows a characteristic stretch in the IR around 1700 cm-1,and a characteristic peak at 202 ppm in the 13C-NMR? Relative integration is shown.

The broadband proton-decoupled 13C NMR spectrum of a hexyl chloride exhibits five signals.Which of these structures could be the correct one for the compound?

Which form of electromagnetic radiation possesses the least energy?

How many 13C signals would 1,3-dichlorobenzene give?

Which proton(s)of the compound below would appear as a triplet in the 1H NMR spectrum?

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

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C6H10O2? The 13C-NMR shows characteristic chemical shifts at 22.3,31.1,117.3,157.7,and 171.6 ppm.Relative integration is shown.

What compound is used as the standard "zero" reference in both carbon and proton NMR?

A shielded proton will absorb at a higher frequency (this is the ________ end of the spectrum);and a deshielded proton will absorb at a lower frequency (the _____________ end of the spectrum).

If all the protons of 1-fluoropentane could be discerned,which would you expect to be at the lowest field in the 1H NMR spectrum of this compound?

A downfield ( δ\deltaδ 9-10)singlet is observed in the 1H NMR spectrum of:

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C9H18O2 and characteristic 13C-NMR peaks at 11.3,21.6,25.3,49.4,67.1,and 175.5 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?

The 1H NMR spectrum of which of the compounds below,all of formula C7H12O2,would consist of two singlets only?

Which of these compounds will not be represented by a singlet only in the 1H NMR spectrum?

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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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.

Which proton(s)of the compound below would appear as a septet in the ¹H NMR spectrum?

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₁₁H₁₄O₂? Looking at the ¹³C-NMR you notice a peak at 174 ppm.Relative integration is shown.

What is the molecular formula of this compound? m/z Intensity 78 M ⁺ _$\bullet$ 10)00 79 1 80 3)3 81 0)3

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₅H₁₁NO,which shows a characteristic stretch in the IR around 1700 cm^-1,and a characteristic peak at 202 ppm in the ¹³C-NMR? Relative integration is shown.

The broadband proton-decoupled ¹³C NMR spectrum of a hexyl chloride exhibits five signals.Which of these structures could be the correct one for the compound?

How many ¹³C signals would 1,3-dichlorobenzene give?

Which proton(s)of the compound below would appear as a triplet in the ¹H NMR spectrum?

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

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₆H₁₀O₂? The ¹³C-NMR shows characteristic chemical shifts at 22.3,31.1,117.3,157.7,and 171.6 ppm.Relative integration is shown.

A shielded proton will absorb at a higher frequency (this is the end of the spectrum);and a deshielded proton will absorb at a lower frequency (the _____ end of the spectrum).

If all the protons of 1-fluoropentane could be discerned,which would you expect to be at the lowest field in the ¹H NMR spectrum of this compound?

A downfield ( $\delta$ 9-10)singlet is observed in the ¹H NMR spectrum of:

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₉H₁₈O₂ and characteristic ¹³C-NMR peaks at 11.3,21.6,25.3,49.4,67.1,and 175.5 ppm? Relative integration is shown.

The ¹H NMR spectrum of which of the compounds below,all of formula C₇H₁₂O₂,would consist of two singlets only?

Which of these compounds will not be represented by a singlet only in the ¹H NMR spectrum?