Question 1

For each of the following compounds, indicate how many 13C NMR signals will be observed. 13C 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" class="answers-bank-image d-inline" rel="preload" >

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: 5E) B) and D)
F) A) and B)

Question 2

An unknown compound X has the molecular formula C6H12O2. Compound X shows a strong peak in its IR spectrum at 1700 cm-1. The 1H NMR spectral data of compound X is given below. What is the structure of compound X? 6H12O2. Compound X shows a strong peak in its IR spectrum at 1700 cm-1. The 1H NMR spectral data of compound X is given below. What is the structure of compound X?   A)  I B)  II C)  III D)  IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) A) and C)
F) B) and C)

Question 3

Which of the indicated protons absorbs furthest downfield? a B)  Hb C)  Hc D)  Hd" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Ha
B)   Hb
C)   Hc
D)   HdE) A) and B)
F) A) and C)

Question 4

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 frequencyF) A) and B)
G) A) and C)

Question 5

Into how many peaks will each of the circled protons be split?

Accepted Answer

A)   I = 3; II = 7; III = 4.
B)   I = 2; II = 7; III = 4.
C)   I = 2; II = 7; III = 3.
D)   I = 2; II = 6; III = 4.E) B) and C)
F) A) and D)

Question 6

Compound X has a molecular formula C8H10, and gives the 1H NMR spectrum below. What is the structure of X? 8H10, and gives the 1H NMR spectrum below. What is the structure of X?   A)  A B)  B C)  C D)  D" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) A) and D)
F) B) and C)

Question 7

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

Accepted Answer

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

Question 8

Into how many peaks will each of the circled protons be split?

Accepted Answer

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

Question 9

Which of the following compounds would give rise to a 13C spectrum with 6 peaks? 13C spectrum with 6 peaks?   A)  I B)  II C)  III D)  IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) None of the above
F) A) and B)

Question 10

An unknown compound X has the molecular formula C6H14O. Compound X shows a peak in its IR spectrum at 3200-3600 cm-1. The 1H NMR spectral data for compound X is given below. What is the structure of compound X? 6H14O. Compound X shows a peak in its IR spectrum at 3200-3600 cm-1. The 1H NMR spectral data for compound X is given below. What is the structure of compound X?   A)  I B)  II C)  III D)  IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) C) and D)
F) All of the above

Question 11

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.E) A) and D)
F) None of the above

Question 12

How many peaks would be observed for each of the circled protons in the compounds below?

Accepted Answer

A)   I = 2; II = 6; III = 1.
B)   I = 3; II = 5; III = 2.
C)   I = 1; II = 5; III = 1.
D)   I = 2; II = 6; III = 2.E) C) and D)
F) B) and D)

Question 13

An unknown compound X has the molecular formula C6H14O. Compound X shows a strong peak in its IR spectrum at 3000 cm-1. The 1H NMR spectral data of compound X is given below. What is the structure of compound X? 6H14O. Compound X shows a strong peak in its IR spectrum at 3000 cm-1. The 1H NMR spectral data of compound X is given below. What is the structure of compound X?   A)  I B)  II C)  III D)  IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) All of the above
F) A) and B)

Question 14

How many peaks would be observed for each of the circled protons in the compounds below?

Accepted Answer

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

Question 15

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? 12H16O. 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?   A)  I B)  II C)  III D)  IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) None of the above
F) B) and C)

Question 16

Which of the following statements is true about electromagnetic radiation?

Accepted Answer

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) C) and E)
G) A) and D)

Question 17

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

Accepted Answer

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

Question 18

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)   "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) B) and D)
F) None of the above

Question 19

Which of the labeled protons absorbs furthest upfield in the 1H NMR spectrum? 1H NMR spectrum?   A)  Ha B)  Hb C)  Hc D)  Hd" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Ha
B)   Hb
C)   Hc
D)   HdE) A) and B)
F) None of the above

Question 20

An unknown compound X has the molecular formula C7H13OBr. Compound X shows a strong peak in its IR spectrum at 1700 cm-1. The 1H NMR spectral data of compound X is given below. What is the structure of compound X? 7H13OBr. Compound X shows a strong peak in its IR spectrum at 1700 cm-1. The 1H NMR spectral data of compound X is given below. What is the structure of compound X?   A)  I B)  II C)  III D)  IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) C) and D)
F) B) and D)

Exam 14: Nuclear Magnetic Resonance Spectroscopy

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?

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

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

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How many peaks would be observed for each of the circled protons in the compounds below?

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Into how many peaks will each of the circled protons be split?

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Compound X has a molecular formula C8H10, and gives the 1H NMR spectrum below. What is the structure of X?

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Which of the following statements is true about electromagnetic radiation?

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An unknown compound X has the molecular formula C6H14O. Compound X shows a peak in its IR spectrum at 3200-3600 cm-1. The 1H NMR spectral data for compound X is given below. What is the structure of compound X?

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

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Which of the following compounds would give rise to a 13C spectrum with 6 peaks?

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Into how many peaks will each of the circled protons be split?

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Which of the indicated protons absorbs furthest downfield?

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An unknown compound X has the molecular formula C6H12O2. Compound X shows a strong peak in its IR spectrum at 1700 cm-1. The 1H NMR spectral data of compound X is given below. What is the structure of compound X?

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Which of the labeled protons absorbs furthest upfield in the 1H NMR spectrum?

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

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How many peaks would be observed for each of the circled protons in the compounds below?

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An unknown compound X has the molecular formula C6H14O. Compound X shows a strong peak in its IR spectrum at 3000 cm-1. The 1H NMR spectral data of compound X is given below. What is the structure of compound X?

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

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An unknown compound X has the molecular formula C7H13OBr. Compound X shows a strong peak in its IR spectrum at 1700 cm-1. The 1H NMR spectral data of compound X is given below. What is the structure of compound X?

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

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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?

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

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Compound X has a molecular formula C₈H₁₀, and gives the ¹H NMR spectrum below. What is the structure of X?

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An unknown compound X has the molecular formula C₆H₁₄O. Compound X shows a peak in its IR spectrum at 3200-3600 cm^-1. The ¹H NMR spectral data for compound X is given below. What is the structure of compound X?

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Which of the following compounds would give rise to a ¹³C spectrum with 6 peaks?

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An unknown compound X has the molecular formula C₆H₁₂O₂. Compound X shows a strong peak in its IR spectrum at 1700 cm^-1. The ¹H NMR spectral data of compound X is given below. What is the structure of compound X?

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Which of the labeled protons absorbs furthest upfield in the ¹H NMR spectrum?

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

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An unknown compound X has the molecular formula C₆H₁₄O. Compound X shows a strong peak in its IR spectrum at 3000 cm^-1. The ¹H NMR spectral data of compound X is given below. What is the structure of compound X?

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An unknown compound X has the molecular formula C₇H₁₃OBr. Compound X shows a strong peak in its IR spectrum at 1700 cm^-1. The ¹H NMR spectral data of compound X is given below. What is the structure of compound X?

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