Question 1

Which of the following is true for pair of enantiotopic protons? 
1.They will appear at the same chemical shift in an achiral (i.e., nonchiral)  environment
2.They will appear at the same chemical shifts in a chiral environment

Accepted Answer

A)   only 1
B)   only 2
C)   neither 1 nor 2
D)   both 1 and 2E) B) and C)
F) All of the above

Question 2

Identify the compound (C8H10) that gives the following 1H NMR spectrum.

Accepted Answer

m-xylene (...

Question 3

How many signals appear in the proton-decoupled 13C NMR spectrum of 4-bromotoluene?

Accepted Answer

A)   3
B)   4
C)   5
D)   7E) A) and C)
F) B) and C)

Question 4

The coupling constant, J, between the protons of chloroethane is 7 Hz when the spectrum is obtained at 250 MHz. What is the coupling constant between these protons when the spectrum is acquired at 500 MHz?

Accepted Answer

A)   3.5 Hz
B)   7 Hz
C)   14 Hz
D)   21 HzE) All of the above
F) B) and C)

Question 5

Which of the following is true for pair of homotropic protons? 
1.They will appear at the same chemical shift in an achiral (i.e., nonchiral)  environment
2.They will appear at the same chemical shifts in a chiral environment

Accepted Answer

A)   only 1
B)   only 2
C)   neither 1 nor 2
D)   both 1 and 2E) None of the above
F) A) and B)

Question 6

Which feature in the 1H NMR spectrum provides information about the number of neighboring protons of each proton in the compound?

Accepted Answer

A)   number of signals
B)   integral
C)   multiplicity
D)   chemical shiftE) A) and C)
F) A) and B)

Question 7

What is the splitting of the signal in the 1H NMR spectrum for the methyl protons of 1-bomo-2-methylpropane?

Accepted Answer

A)   singlet
B)   doublet
C)   triplet
D)   nonetE) All of the above
F) A) and B)

Question 8

How many signals appear in the proton-decoupled 13C NMR spectrum of 2-bromotoluene?

Accepted Answer

A)   3
B)   4
C)   5
D)   7E) B) and D)
F) C) and D)

Question 9

Which C8H10 compound gives the following 1H NMR spectrum? 8H10 compound gives the following 1H NMR spectrum?   A)  1 B)  2 C)  3 D)  4" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) All of the above
F) A) and D)

Question 10

Which of the protons in the following molecule appear at the highest d-value in the 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) B) and C)

Question 11

How many sets of equivalent protons are there in hexane?

Accepted Answer

A)   2
B)   3
C)   6
D)   7E) B) and C)
F) B) and D)

Question 12

Which of the carbon atoms in the following molecule appears furthest downfield in the 13C NMR spectrum? 13C 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) B) and D)
F) None of the above

Question 13

How many signals appear in the proton-decoupled 13C NMR spectrum of 3-bromotoluene?

Accepted Answer

A)   3
B)   4
C)   5
D)   7E) B) and D)
F) A) and D)

Question 14

Which of the following combinations of peaks appears in the 1H NMR spectrum of 1,4-dimethyoxyethane, CH3OCH2CH2CH2CH2OCH3?

Accepted Answer

A)   three singlets
B)   a singlet, a triplet, and a quintet
C)   a singlet and two triplets
D)   a doublet and a tripletE) All of the above
F) A) and C)

Question 15

Which of the following is true for pair of diastereotopic protons? 
1.They will appear at the same chemical shift in an achiral (i.e., nonchiral)  environment
2.They will appear at the same chemical shifts in a chiral environment

Accepted Answer

A)   only 1
B)   only 2
C)   neither 1 nor 2
D)   both 1 and 2E) A) and B)
F) B) and C)

Question 16

Which of the following combinations of peaks appears in the 1H NMR spectrum of 1,2-dimethyoxyethane, CH3OCH2CH2OCH3?

Accepted Answer

A)   two singlets
B)   a singlet and a triplet
C)   a singlet and two triplets
D)   a doublet and a tripletE) A) and D)
F) C) and D)

Question 17

Which of the following compounds gives a 1H NMR spectrum consisting of only two singlets?

Accepted Answer

A)   CH3OCH2CH2OCH2CH3
B)   CH3OCH2CH2CH2CH2OH
C)   CH3OC(CH3) 2OCH3
D)   CH3OCH2CH(CH3) OCH3E) A) and B)
F) A) and C)

Question 18

Which C6H12O2 compound gives the following 1H NMR spectrum? 6H12O2 compound gives the following 1H NMR spectrum?   A)  1 B)  2 C)  3 D)  4" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) B) and C)
F) A) and C)

Question 19

Identify the compound (C4H8O) that gives the following 1H NMR spectrum.

Accepted Answer

Question 20

Which of the protons in the following molecule appear at the highest d-value in the 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) C) and D)
F) A) and D)

Exam 13: Nuclear Magnetic Resonance Spectroscopy

Which of the following is true for pair of enantiotopic protons? 1.They will appear at the same chemical shift in an achiral (i.e., nonchiral) environment 2.They will appear at the same chemical shifts in a chiral environment

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Which C6H12O2 compound gives the following 1H NMR spectrum?

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How many signals appear in the proton-decoupled 13C NMR spectrum of 4-bromotoluene?

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Which feature in the 1H NMR spectrum provides information about the number of neighboring protons of each proton in the compound?

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Which of the following combinations of peaks appears in the 1H NMR spectrum of 1,2-dimethyoxyethane, CH3OCH2CH2OCH3?

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Identify the compound (C8H10) that gives the following 1H NMR spectrum.

Correct Answerverifiedm-xylene (...View AnswerShow Answer

Which of the protons in the following molecule appear at the highest d-value in the 1H NMR spectrum?

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Which of the protons in the following molecule appear at the highest d-value in the 1H NMR spectrum?

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Identify the compound (C4H8O) that gives the following 1H NMR spectrum.

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How many signals appear in the proton-decoupled 13C NMR spectrum of 3-bromotoluene?

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Which C8H10 compound gives the following 1H NMR spectrum?

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Which of the following combinations of peaks appears in the 1H NMR spectrum of 1,4-dimethyoxyethane, CH3OCH2CH2CH2CH2OCH3?

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What is the splitting of the signal in the 1H NMR spectrum for the methyl protons of 1-bomo-2-methylpropane?

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How many signals appear in the proton-decoupled 13C NMR spectrum of 2-bromotoluene?

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Which of the following compounds gives a 1H NMR spectrum consisting of only two singlets?

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Which of the carbon atoms in the following molecule appears furthest downfield in the 13C NMR spectrum?

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How many sets of equivalent protons are there in hexane?

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Which of the following is true for pair of diastereotopic protons? 1.They will appear at the same chemical shift in an achiral (i.e., nonchiral) environment 2.They will appear at the same chemical shifts in a chiral environment

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Which of the following is true for pair of homotropic protons? 1.They will appear at the same chemical shift in an achiral (i.e., nonchiral) environment 2.They will appear at the same chemical shifts in a chiral environment

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The coupling constant, J, between the protons of chloroethane is 7 Hz when the spectrum is obtained at 250 MHz. What is the coupling constant between these protons when the spectrum is acquired at 500 MHz?

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Which C₆H₁₂O₂ compound gives the following ¹H NMR spectrum?

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How many signals appear in the proton-decoupled ¹³C NMR spectrum of 4-bromotoluene?

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Which feature in the ¹H NMR spectrum provides information about the number of neighboring protons of each proton in the compound?

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Which of the following combinations of peaks appears in the ¹H NMR spectrum of 1,2-dimethyoxyethane, CH₃OCH₂CH₂OCH₃?

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Identify the compound (C₈H₁₀) that gives the following ¹H NMR spectrum.

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m-xylene (...
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Which of the protons in the following molecule appear at the highest d-value in the ¹H NMR spectrum?

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Which of the protons in the following molecule appear at the highest d-value in the ¹H NMR spectrum?

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Identify the compound (C₄H₈O) that gives the following ¹H NMR spectrum.

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How many signals appear in the proton-decoupled ¹³C NMR spectrum of 3-bromotoluene?

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Which C₈H₁₀ compound gives the following ¹H NMR spectrum?

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Which of the following combinations of peaks appears in the ¹H NMR spectrum of 1,4-dimethyoxyethane, CH₃OCH₂CH₂CH₂CH₂OCH₃?

Correct Answer
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What is the splitting of the signal in the ¹H NMR spectrum for the methyl protons of 1-bomo-2-methylpropane?

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How many signals appear in the proton-decoupled ¹³C NMR spectrum of 2-bromotoluene?

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Which of the following compounds gives a ¹H NMR spectrum consisting of only two singlets?

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Which of the carbon atoms in the following molecule appears furthest downfield in the ¹³C NMR spectrum?

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