Question 1

What region of the electromagnetic spectrum does nuclear magnet resonance spectroscopy use?

Accepted Answer

A) Radio frequency 
B) Microwave frequency 
C) Infrared frequency 
D) Visible frequency 
E) Ultraviolet frequency 
A) Radio frequency 
B) Microwave frequency 
C) Infrared frequency 
D) Visible frequency 
E) Ultraviolet frequency

Question 2

For each of the following compounds, indicate how many 13C NMR signals will be observed.

Accepted Answer

A) a: 4; b: 4; c: 7; d: 4 
B) a: 5; b: 4; c: 7; d: 3 
C) a: 4; b: 7; c: 7; d: 3 
D) a: 5; b: 4; c: 6; d: 5 
A) a: 4; b: 4; c: 7; d: 4 
B) a: 5; b: 4; c: 7; d: 3 
C) a: 4; b: 7; c: 7; d: 3 
D) a: 5; b: 4; c: 6; d: 5

Question 3

What effect does increasing the operating frequency of a 1H NMR spectrum have on the magnitude of a coupling constant J in Hz?

Accepted Answer

A) Magnitude of coupling constant J in Hz will also increase. 
B) Magnitude of coupling constant J in Hz will decrease. 
C) Magnitude of coupling constant J in Hz will remain the same. 
D) It is not possible to predict the change in the magnitude of coupling constant J in Hz. 
A) Magnitude of coupling constant J in Hz will also increase. 
B) Magnitude of coupling constant J in Hz will decrease. 
C) Magnitude of coupling constant J in Hz will remain the same. 
D) It is not possible to predict the change in the magnitude of coupling constant J in Hz.

Question 4

How many unique protons are present in each of the following compounds?

Accepted Answer

A) I = 6; II = 3; III = 6. 
B) I = 5; II = 4; III = 6. 
C) I = 6; II = 4; III = 4. 
D) I = 6; II = 4; III = 6. 
A) I = 6; II = 3; III = 6. 
B) I = 5; II = 4; III = 6. 
C) I = 6; II = 4; III = 4. 
D) I = 6; II = 4; III = 6.

Question 5

What is the relationship between Ha and Hb in the following compound?

Accepted Answer

A) Homotopic 
B) Enantiotopic 
C) Diastereotopic 
D) Mesotopic 
A) Homotopic 
B) Enantiotopic 
C) Diastereotopic 
D) Mesotopic

Question 6

Which of the indicated protons absorbs further downfield?

Accepted Answer

A) HA 
B) HB 
C) HC 
D) HD 
A) HA 
B) HB 
C) HC 
D) HD

Question 7

How many different kinds of protons are present in each of the following molecules?

Accepted Answer

A) I = 3; II = 5; III = 5; IV = 4; V = 3. 
B) I = 4; II = 5; III = 4; IV = 4; V = 3. 
C) I = 4; II = 5; III = 5; IV = 4; V = 3. 
D) I = 4; II = 5; III = 5; IV = 3; V = 4. 
A) I = 3; II = 5; III = 5; IV = 4; V = 3. 
B) I = 4; II = 5; III = 4; IV = 4; V = 3. 
C) I = 4; II = 5; III = 5; IV = 4; V = 3. 
D) I = 4; II = 5; III = 5; IV = 3; V = 4.

Question 8

Which of the following spectroscopy methods does not involve the interaction of organic molecules with electromagnetic radiation?

Accepted Answer

A) Nuclear magnetic resonance 
B) Infrared spectroscopy 
C) Mass spectroscopy 
D) Ultraviolet spectroscopy 
A) Nuclear magnetic resonance 
B) Infrared spectroscopy 
C) Mass spectroscopy 
D) Ultraviolet spectroscopy

Question 9

Which of the following statements about 13C NMR is not true?

Accepted Answer

A) In 13C proton-decoupled NMR spectra, all peaks are singlets. 
B) (13
C)  NMR spectra display peaks for only carbons that bear hydrogen atoms. 
C) (13
C)  NMR chemical shifts occur over a greater range than 1H NMR chemical shifts. 
D) (13
C)  NMR easily differentiates between the different hybridized carbons (sp3, sp2, and sp hybridized carbons). 
A) In 13C proton-decoupled NMR spectra, all peaks are singlets. 
B) (13
C)  NMR spectra display peaks for only carbons that bear hydrogen atoms. 
C) (13
C)  NMR chemical shifts occur over a greater range than 1H NMR chemical shifts. 
D) (13
C)  NMR easily differentiates between the different hybridized carbons (sp3, sp2, and sp hybridized carbons).

What region of the electromagnetic spectrum does nuclear magnet resonance spectroscopy use?

For each of the following compounds, indicate how many ¹³C NMR signals will be observed.

What effect does increasing the operating frequency of a ¹H NMR spectrum have on the magnitude of a coupling constant J in Hz?

How many unique protons are present in each of the following compounds?

What is the relationship between H_a and H_b in the following compound?

Which of the indicated protons absorbs further downfield?

How many different kinds of protons are present in each of the following molecules?

Which of the following spectroscopy methods does not involve the interaction of organic molecules with electromagnetic radiation?

Which of the following statements about ¹³C NMR is not true?

Structure and Bonding

Acids and Bases

Introduction to Organic Molecules and Functional Groups

Alkanes

Stereochemistry

Understanding Organic Reactions

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols, Ethers, and Related Compounds

Alkenes

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Radical Reactions

Conjugation, Resonance, and Dienes

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry;

Aldehydes and Ketones Nucleophilic Addition

Carboxylic Acids and Derivatives

Substitution Reactions of Carbonyl Compounds at the Alpha-Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Synthetic Polymers

Lipids

Filters

Exam 14: Nuclear Magnetic Resonance Spectroscopy

What region of the electromagnetic spectrum does nuclear magnet resonance spectroscopy use?

For each of the following compounds, indicate how many 13C NMR signals will be observed.

What effect does increasing the operating frequency of a 1H NMR spectrum have on the magnitude of a coupling constant J in Hz?

How many unique protons are present in each of the following compounds?

What is the relationship between Ha and Hb in the following compound?

Which of the indicated protons absorbs further downfield?

How many different kinds of protons are present in each of the following molecules?

Which of the following spectroscopy methods does not involve the interaction of organic molecules with electromagnetic radiation?

Which of the following statements about 13C NMR is not true?

Structure and Bonding

Acids and Bases

Introduction to Organic Molecules and Functional Groups

Alkanes

Stereochemistry

Understanding Organic Reactions

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols, Ethers, and Related Compounds

Alkenes

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Radical Reactions

Conjugation, Resonance, and Dienes

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry;

Aldehydes and Ketones Nucleophilic Addition

Carboxylic Acids and Derivatives

Substitution Reactions of Carbonyl Compounds at the Alpha-Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Synthetic Polymers

Lipids

Filters

For each of the following compounds, indicate how many ¹³C NMR signals will be observed.

What effect does increasing the operating frequency of a ¹H NMR spectrum have on the magnitude of a coupling constant J in Hz?

What is the relationship between H_a and H_b in the following compound?

Which of the following statements about ¹³C NMR is not true?