Question 1

A compound with molecular formula C8H11N displays the following IR, 1H NMR, 13C NMR spectra. Propose a structure for this compound.   
 
SDBS

Accepted Answer

Question 2

_______ protons experience a net magnetic field strength that is smaller than the applied magnetic field.

Accepted Answer

A)  Deshielded 
B)  Shielded 
C)  Paramagnetic 
D)  Diamagnetic 
E)  none of these 
A)  Deshielded 
B)  Shielded 
C)  Paramagnetic 
D)  Diamagnetic 
E)  none of these

Question 3

Which of the following is the maximum multiplicity observed for Hc protons in the following compound? Assume that Jcd and Jcb values are different.

Accepted Answer

A)  5 
B)  6 
C)  8 
D)  12 
E)  none of these 
A)  5 
B)  6 
C)  8 
D)  12 
E)  none of these

Question 4

Which of the following structures is consistent with this 1H NMR spectrum?                   SDBS: National Institute of Advanced Industrial Science and Technology

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these

Question 5

Protons Ha and Hb in the following compound are _________.

Accepted Answer

A)  homotopic 
B)  enantiotopic 
C)  diastereotopic 
D)  mesotopic 
E)  none of these 
A)  homotopic 
B)  enantiotopic 
C)  diastereotopic 
D)  mesotopic 
E)  none of these

Question 6

Which of the following is true about the shape (multiplicity) of the signal in a 1H NMR spectrum?

Accepted Answer

A)  it indicates the number of neighboring protons 
B)  it indicates the electronic environment of neighboring protons 
C)  it indicates the number of different protons 
D)  it indicates the electronic environment of absorbing protons 
E)  it indicates the number of protons in the signal 
A)  it indicates the number of neighboring protons 
B)  it indicates the electronic environment of neighboring protons 
C)  it indicates the number of different protons 
D)  it indicates the electronic environment of absorbing protons 
E)  it indicates the number of protons in the signal

Question 7

A compound with a molecular formula C9H10O2 has the following 1H NMR spectrum. Which of the following structures is consistent with this spectrum? SHAPE \* MERGEFORMAT

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these

Question 8

_______ protons experience a net magnetic field strength that is higher than the _____ protons.

Accepted Answer

A)  Deshielded, shielded 
B)  Shielded, deshielded 
C)  Paramagnetic, diamagnetic 
D)  Shielded, diamagnetic 
E)  none of these 
A)  Deshielded, shielded 
B)  Shielded, deshielded 
C)  Paramagnetic, diamagnetic 
D)  Shielded, diamagnetic 
E)  none of these

Question 9

Which of the following nuclei cannot be analyzed by an NMR spectrometer?

Accepted Answer

A)  nucleus with odd number of protons & odd number of neutrons 
B)  nucleus with odd number of protons &even number of neutrons 
C)  nucleus with even number of protons & odd number of neutrons 
D)  nucleus with even number of protons & even number of neutrons 
E)  none of these 
A)  nucleus with odd number of protons & odd number of neutrons 
B)  nucleus with odd number of protons &even number of neutrons 
C)  nucleus with even number of protons & odd number of neutrons 
D)  nucleus with even number of protons & even number of neutrons 
E)  none of these

Question 10

Which of the indicated protons in the following compound would appear most upfield in the 1H NMR spectrum?

Accepted Answer

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

Question 11

Which of the following is true about the area under each signal in a 1H NMR spectrum?

Accepted Answer

A)  it indicates the number of neighboring protons 
B)  it indicates the electronic environment of neighboring protons 
C)  it indicates the number of different protons 
D)  it indicates the electronic environment of absorbing protons 
E)  it indicates the relative number of protons in the signal 
A)  it indicates the number of neighboring protons 
B)  it indicates the electronic environment of neighboring protons 
C)  it indicates the number of different protons 
D)  it indicates the electronic environment of absorbing protons 
E)  it indicates the relative number of protons in the signal

Question 12

Protons Ha and Hb in the following compound are _________.

Accepted Answer

A)  homotopic 
B)  enantiotopic 
C)  diastereotopic 
D)  mesotopic 
E)  none of these 
A)  homotopic 
B)  enantiotopic 
C)  diastereotopic 
D)  mesotopic 
E)  none of these

Question 13

Which of the following is true about the relationship between the energy gap (∆E) between the spin states for a 1H nucleus and the strength of the external magnetic field?

Accepted Answer

A)  they are inversely proportional 
B)  they are directly proportional 
C)  there is no relationship 
D)  the magnetic field is slightly less 
E)  none of these 
A)  they are inversely proportional 
B)  they are directly proportional 
C)  there is no relationship 
D)  the magnetic field is slightly less 
E)  none of these

Question 14

Which of the following displays a negative signal in the DEPT-135 13C NMR spectroscopy?

Accepted Answer

A)  CH3 
B)  CH2 
C)  CH 
D)  C 
E)  none of these 
A)  CH3 
B)  CH2 
C)  CH 
D)  C 
E)  none of these

Question 15

A compound with molecular formula C8H14O3 displays the following IR, 1H NMR, 13C NMR spectra. Propose a structure for this compound.   
 
SDBS

Accepted Answer

Question 16

How would you use 1H NMR spectroscopy to distinguish between the following compounds?

Accepted Answer

Both compounds will have five

Question 17

Determine the multiplicity of each signal in the expected 1H NMR spectrum of the following compound.

Accepted Answer

Question 18

A compound with molecular formula C3H6O2 displays the following IR, 1H NMR and 13C NMR spectra. Propose a structure for this compound.

Accepted Answer

Question 19

A compound with a molecular formula C5H11NO has the following 1H NMR spectrum. The IR spectrum shows an absorption at around 3400 cm-1. Which of the following structures is consistent with this spectrum?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these

Question 20

How would you use 1H NMR spectroscopy to distinguish between the following compounds?

Accepted Answer

A)  I = 3 and II = 2 signals 
B)  I = 4 and II = 3 signals 
C)  I = 5 and II = 3 signals 
D)  I = 5 and II = 4 signals 
E)  I = 3 and II = 4 signales 
A)  I = 3 and II = 2 signals 
B)  I = 4 and II = 3 signals 
C)  I = 5 and II = 3 signals 
D)  I = 5 and II = 4 signals 
E)  I = 3 and II = 4 signales

Exam 15: Nuclear Magnetic Resonance Spectroscopy

A compound with molecular formula C8H11N displays the following IR, 1H NMR, 13C NMR spectra. Propose a structure for this compound. SDBS

_______ protons experience a net magnetic field strength that is smaller than the applied magnetic field.

Which of the following is the maximum multiplicity observed for Hc protons in the following compound? Assume that Jcd and Jcb values are different.

Which of the following structures is consistent with this 1H NMR spectrum? SDBS: National Institute of Advanced Industrial Science and Technology

Protons Ha and Hb in the following compound are _________.

Which of the following is true about the shape (multiplicity) of the signal in a 1H NMR spectrum?

A compound with a molecular formula C9H10O2 has the following 1H NMR spectrum. Which of the following structures is consistent with this spectrum? SHAPE \* MERGEFORMAT

_______ protons experience a net magnetic field strength that is higher than the _____ protons.

Which of the following nuclei cannot be analyzed by an NMR spectrometer?

Which of the indicated protons in the following compound would appear most upfield in the 1H NMR spectrum?

Which of the following is true about the area under each signal in a 1H NMR spectrum?

Protons Ha and Hb in the following compound are _________.

Which of the following is true about the relationship between the energy gap (∆E) between the spin states for a 1H nucleus and the strength of the external magnetic field?

Which of the following displays a negative signal in the DEPT-135 13C NMR spectroscopy?

A compound with molecular formula C8H14O3 displays the following IR, 1H NMR, 13C NMR spectra. Propose a structure for this compound. SDBS

How would you use 1H NMR spectroscopy to distinguish between the following compounds?

Determine the multiplicity of each signal in the expected 1H NMR spectrum of the following compound.

A compound with molecular formula C3H6O2 displays the following IR, 1H NMR and 13C NMR spectra. Propose a structure for this compound.

A compound with a molecular formula C5H11NO has the following 1H NMR spectrum. The IR spectrum shows an absorption at around 3400 cm-1. Which of the following structures is consistent with this spectrum?

How would you use 1H NMR spectroscopy to distinguish between the following compounds?

A Review of General Chemistry: Electrons, Bonds, and Molecular Properties

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Chemical Reactivity and Mechanisms

Alkyl Halides: Nucleophilic Substitution and Elimination Reactions

Addition Reactions of Alkenes

Alkynes

Radical Reactions

Synthesis

Alcohols and Phenols

Ethers and Epoxides; Thiols and Sulfides

Infrared Spectroscopy and Mass Spectrometry

Conjugated Pi Systems and Pericyclic Reactions

Aromatic Compounds

Aromatic Substitution Reactions

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Alpha Carbon Chemistry: Enols and Enolates

Amines

Introduction to Organometallic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

A compound with molecular formula C₈H₁₁N displays the following IR, ¹H NMR, ¹³C NMR spectra. Propose a structure for this compound. SDBS

Which of the following is the maximum multiplicity observed for H_c protons in the following compound? Assume that J_cd and J_cb values are different.

Which of the following structures is consistent with this ¹H NMR spectrum? SDBS: National Institute of Advanced Industrial Science and Technology

Protons H_a and H_b in the following compound are _________.

Which of the following is true about the shape (multiplicity) of the signal in a ¹H NMR spectrum?

___ protons experience a net magnetic field strength that is higher than the _ protons.

Which of the indicated protons in the following compound would appear most upfield in the ¹H NMR spectrum?

Which of the following is true about the area under each signal in a ¹H NMR spectrum?

Protons H_a and H_b in the following compound are _________.

Which of the following is true about the relationship between the energy gap (∆E) between the spin states for a ¹H nucleus and the strength of the external magnetic field?

Which of the following displays a negative signal in the DEPT-135 ¹³C NMR spectroscopy?

A compound with molecular formula C₈H₁₄O₃ displays the following IR, ¹H NMR, ¹³C NMR spectra. Propose a structure for this compound. SDBS

How would you use ¹H NMR spectroscopy to distinguish between the following compounds?

Determine the multiplicity of each signal in the expected ¹H NMR spectrum of the following compound.

A compound with molecular formula C₃H₆O₂ displays the following IR, ¹H NMR and ¹³C NMR spectra. Propose a structure for this compound.

A compound with a molecular formula C₅H₁₁NO has the following ¹H NMR spectrum. The IR spectrum shows an absorption at around 3400 cm^-1. Which of the following structures is consistent with this spectrum?

How would you use ¹H NMR spectroscopy to distinguish between the following compounds?