Question 1

How will the methyl carbon appear in the proton off-resonance decoupled 13C spectrum of toluene?

Accepted Answer

A)  Singlet 
B)  Doublet 
C)  Triplet 
D)  Quartet 
E)  Quintet 
A)  Singlet 
B)  Doublet 
C)  Triplet 
D)  Quartet 
E)  Quintet

Question 2

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

Accepted Answer

A)  1.00 ppm,singlet 
B)  2.10 ppm,singlet 
C)  2.10 ppm,quartet 
D)  3.00 ppm,singlet 
E)  2.10 ppm,triplet 
A)  1.00 ppm,singlet 
B)  2.10 ppm,singlet 
C)  2.10 ppm,quartet 
D)  3.00 ppm,singlet 
E)  2.10 ppm,triplet

Question 3

In mass spectrometry,the most intense peak is assigned an intensity of 100%,and is referred to as the ______________.

Accepted Answer

The answer of In mass spectrometry,the most intense peak is...

Question 4

The 1H NMR spectrum of which of the compounds below,all of formula C7H12O2,would consist of a singlet,a doublet and a triplet only?

Accepted Answer

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

Question 5

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C5H10O? The IR spectrum does not show any characteristic stretches around 1700 cm-1.Relative integration is shown.

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 6

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

Accepted Answer

A)  The protons on carbon I 
B)  The protons on carbon II 
C)  The protons on carbon III 
D)  The protons on carbon IV 
E)  The protons on carbon V 
A)  The protons on carbon I 
B)  The protons on carbon II 
C)  The protons on carbon III 
D)  The protons on carbon IV 
E)  The protons on carbon V

Question 7

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C4H7Br? Relative integration is shown.

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 8

Select the structure of a compound C6H14 with a base peak at m/z 43.

Accepted Answer

A)  CH3CH2CH2CH2CH2CH3 
B)  (CH3CH2)2CHCH3 
C)  (CH3)3CCH2CH3 
D)  (CH3)2CHCH(CH3)2 
E)  None of these 
A)  CH3CH2CH2CH2CH2CH3 
B)  (CH3CH2)2CHCH3 
C)  (CH3)3CCH2CH3 
D)  (CH3)2CHCH(CH3)2 
E)  None of these

Question 9

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

Accepted Answer

A)  5.40 ppm,doublet 
B)  1.00 ppm,multiplet 
C)  2.00 ppm,doublet 
D)  1.00 ppm,doublet 
E)  5.40 ppm,multiplet 
A)  5.40 ppm,doublet 
B)  1.00 ppm,multiplet 
C)  2.00 ppm,doublet 
D)  1.00 ppm,doublet 
E)  5.40 ppm,multiplet

Question 10

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C9H10O2? Relative integration is shown.

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 11

A compound C4H9Br gave the following 1H NMR spectrum: triplet,$\delta$ 1.0 (3H);doublet,$\delta$  1.7;multiplet,$\delta$ 1.8;multiplet,$\delta$ 4.1 (1H)
Which is a reasonable structure for the compound?

Accepted Answer

A)  CH3CH2CHBrCH3 
B)  CH3CH2CH2CH2Br 
C)  (CH3)2CHCH2Br 
D)  (CH3)3CBr 
A)  CH3CH2CHBrCH3 
B)  CH3CH2CH2CH2Br 
C)  (CH3)2CHCH2Br 
D)  (CH3)3CBr

Question 12

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C8H15ClO3,which shows a characteristic stretch in the IR around 1750 cm-1 but not around 3500 cm-1,and a characteristic peak at 173 ppm in the 13C-NMR? Relative integration is shown.

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 13

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C9H12O? Relative integration is shown.

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 14

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

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

"NMR" stands for _______________________.

Accepted Answer

The answer of "NMR" stands for _______________________....

Question 17

How many chemically distinct 1H NMR signals are there in the following compound?

Accepted Answer

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

Question 18

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C6H12? Relative integration is shown.

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 19

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

Accepted Answer

A)  3.00 ppm,doublet 
B)  3.00 ppm,triplet 
C)  5.00 ppm,triplet 
D)  1.00 ppm,doublet 
E)  5.40 ppm,multiplet 
A)  3.00 ppm,doublet 
B)  3.00 ppm,triplet 
C)  5.00 ppm,triplet 
D)  1.00 ppm,doublet 
E)  5.40 ppm,multiplet

Question 20

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

Accepted Answer

A)  1.00 ppm,quartet 
B)  2.40 ppm,singlet 
C)  2.40 ppm,quartet 
D)  3.00 ppm,quartet 
E)  1.00 ppm,triplet 
A)  1.00 ppm,quartet 
B)  2.40 ppm,singlet 
C)  2.40 ppm,quartet 
D)  3.00 ppm,quartet 
E)  1.00 ppm,triplet

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

How will the methyl carbon appear in the proton off-resonance decoupled 13C spectrum of toluene?

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

In mass spectrometry,the most intense peak is assigned an intensity of 100%,and is referred to as the ______________.

The 1H NMR spectrum of which of the compounds below,all of formula C7H12O2,would consist of a singlet,a doublet and a triplet only?

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C5H10O? The IR spectrum does not show any characteristic stretches around 1700 cm-1.Relative integration is shown.

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

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C4H7Br? Relative integration is shown.

Select the structure of a compound C6H14 with a base peak at m/z 43.

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

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C9H10O2? Relative integration is shown.

A compound C4H9Br gave the following 1H NMR spectrum: triplet, δ\deltaδ 1.0 (3H);doublet, δ\deltaδ 1.7;multiplet, δ\deltaδ 1.8;multiplet, δ\deltaδ 4.1 (1H) Which is a reasonable structure for the compound?

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C8H15ClO3,which shows a characteristic stretch in the IR around 1750 cm-1 but not around 3500 cm-1,and a characteristic peak at 173 ppm in the 13C-NMR? Relative integration is shown.

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C9H12O? Relative integration is shown.

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

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

"NMR" stands for _______________________.

How many chemically distinct 1H NMR signals are there in the following compound?

What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C6H12? 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?

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

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

Filters

How will the methyl carbon appear in the proton off-resonance decoupled ¹³C spectrum of toluene?

The ¹H NMR spectrum of which of the compounds below,all of formula C₇H₁₂O₂,would consist of a singlet,a doublet and a triplet only?

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₅H₁₀O? The IR spectrum does not show any characteristic stretches around 1700 cm^-1.Relative integration is shown.

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

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₄H₇Br? Relative integration is shown.

Select the structure of a compound C₆H₁₄ with a base peak at m/z 43.

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₉H₁₀O₂? Relative integration is shown.

A compound C₄H₉Br gave the following ¹H NMR spectrum: triplet, $\delta$ 1.0 (3H);doublet, $\delta$ 1.7;multiplet, $\delta$ 1.8;multiplet, $\delta$ 4.1 (1H) Which is a reasonable structure for the compound?

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₈H₁₅ClO₃,which shows a characteristic stretch in the IR around 1750 cm^-1 but not around 3500 cm^-1,and a characteristic peak at 173 ppm in the ¹³C-NMR? Relative integration is shown.

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₉H₁₂O? Relative integration is shown.

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

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

How many chemically distinct ¹H NMR signals are there in the following compound?

What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₆H₁₂? Relative integration is shown.