Question 1

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) A) and C)

Question 2

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

Accepted Answer

A)  I = 8; II = 4; III = 3; IV = 3
B)  I = 7; II = 4; III = 3; IV = 4
C)  I = 7; II = 3; III = 3; IV = 3
D)  I = 7; II = 4; III = 2; IV = 4E) A) and B)
F) A) and C)

Question 3

Which of the indicated protons in the molecules below would absorb furthest downfield in a 1H NMR spectrum? 1H NMR spectrum?   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) C) and D)

Question 4

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

Question 5

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

Question 6

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

Accepted Answer

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 = 1E) A) and B)
F) A) and C) A

Question 7

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 spectrometry
D)  Ultraviolet spectroscopyE) A) and D)
F) B) and C)

Question 8

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 = 3E) B) and C)
F) C) and D)

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

Question 10

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

Accepted Answer

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) C) and D)

Question 11

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

Accepted Answer

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

Question 12

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 = 4E) B) and C)
F) A) and B) C

Question 13

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) A) and B)
G) D) and E)

Question 14

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 B)
F) A) and C)

Question 15

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) B) and C)
G) A) and D)

Question 16

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? 7H14O2.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?   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) B) and C)
F) None of the above

Question 17

Into how many peaks will the circled proton be split?

Accepted Answer

A)  5
B)  6
C)  7
D)  8E) All of the above
F) C) and D)

Question 18

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

Question 19

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 20

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 = 4E) None of the above
F) A) and B)

Exam 32: Organic Spectroscopy Concepts

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the indicated protons in the molecules below would absorb furthest downfield in a 1H NMR spectrum?

Correct AnswerverifiedShow Answer

Which of the indicated protons absorbs furthest downfield?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedC

Which of the following statements is true about electromagnetic radiation?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Into how many peaks will the circled proton be split?

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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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

Correct Answer
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Which of the indicated protons in the molecules below would absorb furthest downfield in a ¹H NMR spectrum?

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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?

Correct Answer
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Correct Answer
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A

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

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B

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

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C

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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?

Correct Answer
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Correct Answer
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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?

Correct Answer
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Correct Answer
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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?

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

Correct Answer
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