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

E) A) and B)
F) A) and C)

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


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

E) A) and C)
F) None of the above

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What effect does increasing the operating frequency of a 1H NMR spectrum have on the magnitude of a 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.

E) A) and B)
F) C) and D)

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


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

E) None of the above
F) A) and C)

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What is the relationship between Ha and Hb in the following compound? What is the relationship between H<sub>a</sub> and H<sub>b</sub> in the following compound? A) Homotopic B) Enantiotopic C) Diastereotopic D) Mesotopic


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

E) A) and B)
F) A) and C)

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Which of the indicated protons absorbs further downfield? Which of the indicated protons absorbs further downfield? A) H<sub>A</sub> B) H<sub>B</sub> C) H<sub>C</sub> D) H<sub>D</sub>


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

E) B) and D)
F) A) and B)

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


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

F) B) and E)
G) None of the above

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

E) A) and B)
F) A) and C)

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

E) B) and C)
F) All of the above

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