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Which of the following compounds would give rise to a 13C spectrum with 6 peaks? Which of the following compounds would give rise to a <sup>13</sup>C spectrum with 6 peaks? A) I B) II C) III D) IV


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

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

Correct Answer

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B

Compound X has a molecular formula C8H10 and gives the 1H NMR spectrum below.What is the structure of X? Compound X has a molecular formula C<sub>8</sub>H<sub>10</sub> and gives the <sup>1</sup>H NMR spectrum below.What is the structure of X? A) A B) B C) C D) D


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

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

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How many different kinds of protons are present in each of the following compounds? How many different kinds of protons are present in each of the following compounds? A) I = 6; II = 5; III = 3. B) I = 7; II = 5; III = 3. C) I = 7; II = 6; III = 3. D) I = 6; II = 6; III = 3.


A) I = 6; II = 5; III = 3.
B) I = 7; II = 5; III = 3.
C) I = 7; II = 6; III = 3.
D) I = 6; II = 6; III = 3.

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

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How many different kinds of protons are present in each of the following compounds? How many different kinds of protons are present in each of the following compounds? A) I = 4; II = 3; III = 1. B) I = 4; II = 4; III = 1. C) I = 4; II = 4; III = 2. D) I = 3; II = 3; III = 1.


A) I = 4; II = 3; III = 1.
B) I = 4; II = 4; III = 1.
C) I = 4; II = 4; III = 2.
D) I = 3; II = 3; III = 1.

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

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Which of the following statements is true about electromagnetic radiation?


A) All molecules absorb electromagnetic radiation at some frequency.
B) Frequency is directly proportional to wavelength.
C) NMR uses the microwave region of the electromagnetic spectrum.
D) The radio frequency region of the electromagnetic spectrum has the largest energy per photon.
E) Energy is inversely proportional to frequency.

F) A) and C)
G) A) and D)

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An unknown compound A has the molecular formula C12H16O.Compound A absorbs strongly in the IR at 1700 cm-1.The NMR spectral data for compound A are given below.What is the structure of compound A? <sup> </sup>An unknown compound A has the molecular formula C<sub>12</sub>H<sub>16</sub>O.Compound A absorbs strongly in the IR at 1700 cm<sup>-1</sup>.The NMR spectral data for compound A are given below.What is the structure of compound A? A) I B) II C) III D) IV


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

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

Correct Answer

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Which of the labeled protons absorbs furthest upfield in the 1H NMR spectrum? Which of the labeled protons absorbs furthest upfield in the <sup>1</sup>H NMR spectrum? 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) A) and D)
F) None of the above

Correct Answer

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How many peaks would be observed for each of the circled protons in the compounds below? How many peaks would be observed for each of the circled protons in the compounds below? A) I = 6; II = 2; III = 3. B) I = 7; II = 3; III = 3. C) I = 7; II = 1; III = 3. D) I = 7; II = 2; III = 3.


A) I = 6; II = 2; III = 3.
B) I = 7; II = 3; III = 3.
C) I = 7; II = 1; III = 3.
D) I = 7; II = 2; III = 3.

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

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An unknown compound A has the molecular formula C7H14O2.Compound A absorbs strongly in the IR at 1700 cm-1.The 1H NMR spectral data for compound A are given below.What is the structure of compound A? <sup> </sup>An unknown compound A has the molecular formula C<sub>7</sub>H<sub>14</sub>O<sub>2</sub>.Compound A absorbs strongly in the IR at 1700 cm<sup>-1</sup>.The <sup>1</sup>H NMR spectral data for compound A are given below.What is the structure of compound A? A) I B) II C) III D) IV


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

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

Correct Answer

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What effect does increasing the operating frequency of a 1H NMR spectrum have on the frequency of an absorption in Hz?


A) Frequency of an absorption in Hz will also increase.
B) Frequency of an absorption in Hz will decrease.
C) Frequency of an absorption in Hz will remain the same.
D) It is not possible to predict the change in frequency of an absorption in Hz.

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

Correct Answer

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Into how many peaks will the circled proton be split? Into how many peaks will the circled proton be split? A) 5 B) 6 C) 7 D) 8


A) 5
B) 6
C) 7
D) 8

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

Correct Answer

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C

Into how many peaks will each of the circled protons be split? Into how many peaks will each of the circled protons be split? A) I = 3; II = 8; III = 1; IV = 4; V = 3. B) I = 9; II = 8; III = 2; IV = 4; V = 4. C) I = 4; II = 8; III = 2; IV = 4; V = 5. D) I = 4; Ii = 7; III = 2; IV = 4; V = 3.


A) I = 3; II = 8; III = 1; IV = 4; V = 3.
B) I = 9; II = 8; III = 2; IV = 4; V = 4.
C) I = 4; II = 8; III = 2; IV = 4; V = 5.
D) I = 4; Ii = 7; III = 2; IV = 4; V = 3.

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

Correct Answer

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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 C)
F) A) and D)

Correct Answer

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Which of the indicated protons absorbs furthest downfield? Which of the indicated protons absorbs furthest 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) A) and D)
F) None of the above

Correct Answer

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How could spectroscopy be used to distinguish between the following compounds? How could spectroscopy be used to distinguish between the following compounds? A) Compound A has a triplet in its <sup>1</sup>H NMR spectrum at 1.0 ppm. B) Compound B has a peak at 3200-3500 cm<sup>-1</sup> in its IR spectrum. C) Compound A has a peak in its IR spectrum at 2900 cm<sup>-1</sup>. D) Compound A has a triplet in its <sup>1</sup>H NMR spectrum at 1.0 ppm and compound B has a peak at 3200-3500 cm<sup>-1</sup> in its IR spectrum.


A) Compound A has a triplet in its 1H NMR spectrum at 1.0 ppm.
B) Compound B has a peak at 3200-3500 cm-1 in its IR spectrum.
C) Compound A has a peak in its IR spectrum at 2900 cm-1.
D) Compound A has a triplet in its 1H NMR spectrum at 1.0 ppm and compound B has a peak at 3200-3500 cm-1 in its IR spectrum.

E) None of the above
F) All of the above

Correct Answer

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How many different kinds of protons are present in each of the following compounds? How many different kinds of protons are present in each of the following compounds? A) a: 5; b: 6 B) a: 5; b: 5 C) a: 4; b: 6 D) a: 4; b: 5


A) a: 5; b: 6
B) a: 5; b: 5
C) a: 4; b: 6
D) a: 4; b: 5

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

Correct Answer

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Which of the indicated protons would absorb furthest downfield in a 1H NMR spectrum? Which of the indicated protons would absorb furthest downfield in a <sup>1</sup>H NMR spectrum? A) I B) II C) III D) IV


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

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

Correct Answer

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How many different kinds of protons are present in each of the following compounds? How many different kinds of protons are present in each of the following compounds? A) I = 2; II = 3; III = 4. B) I = 2; II = 3; III = 3. C) I = 3; II = 3; III = 3. D) I = 3; II = 3; III = 4.


A) I = 2; II = 3; III = 4.
B) I = 2; II = 3; III = 3.
C) I = 3; II = 3; III = 3.
D) I = 3; II = 3; III = 4.

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

Correct Answer

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C

Which of the following compounds does not show only one signal in its 1H NMR spectrum? Which of the following compounds does not show only one signal in its <sup>1</sup>H NMR spectrum? A) I B) II C) III D) IV


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

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

Correct Answer

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Which of the indicated protons in the molecules below would absorb furthest downfield in a 1H NMR spectrum? Which of the indicated protons in the molecules below would absorb furthest downfield in a <sup>1</sup>H NMR spectrum? A) I B) II C) III D) IV


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

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

Correct Answer

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