Question 1

How many signals appear in the proton-decoupled 13C NMR spectrum of 1,4-dibromobenzene?

Accepted Answer

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

Question 2

Identify the compound (C8H10O2) that gives the following 1H NMR spectrum.

Accepted Answer

3-phenylpr...

Question 3

What is the hydrogen deficiency index for a compound with a molecular formula of C6H11N?

Accepted Answer

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

Question 4

For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband hydrogen-decoupled S1U1P113S1S1P0C NMR spectra. Enter the numerical value in the blank provided to the left of the structure.
-_______

Accepted Answer

The answer of For each of the compounds below tell...

Question 5

For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband hydrogen-decoupled S1U1P113S1S1P0C NMR spectra. Enter the numerical value in the blank provided to the left of the structure.
-_______

Accepted Answer

The answer of For each of the compounds below tell...

Question 6

What is the hydrogen deficiency index for a compound with a molecular formula of C10H16O2?

Accepted Answer

A)  1
B)  2
C)  3
D)  4E) B) and C)
F) None of the above

Question 7

Which C9H10O compound gives the following 1H NMR spectrum? 9H10O 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 D)
F) B) and C)

Question 8

Which of the protons in the following molecule appear furthest downfield 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) A) and B)
F) B) and C)

Question 9

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 D)

Question 10

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

Question 11

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

Question 12

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

Question 13

Which of the following combinations of peaks appears in the 1H NMR spectrum of 2-methylpropane?

Accepted Answer

A)  two singlets
B)  a singlet and a nonet
C)  a singlet and a decet
D)  a doublet and a decetE) A) and B)
F) None of the above

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

Question 15

What is the hydrogen deficiency index for a compound with a molecular formula of C6H6Br2?

Accepted Answer

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

Question 16

How many sets of equivalent protons are there in 2-methylhexane?

Accepted Answer

A)  2
B)  3
C)  6
D)  7E) A) and B)
F) All of the above

Question 17

Which of the following compounds gives a 1H NMR spectrum consisting of only a singlet, triplet and quintet?

Accepted Answer

A)  CH3OCH2CH2CH2CH2OH
B)  CH3OCH2CH2OCH2CH3
C)  CH3OCH2CH2CH2OCH3
D)  CH3OCH2CH(CH3) OCH3E) None of the above
F) A) and B)

Question 18

Consider the compound shown below.  The above compound would produce a signal further downfield in a 13C NMR spectrum than

Accepted Answer

A) True 
 B)False

Question 19

Which of the protons in the following molecule appear furthest downfield 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) A) and D)
F) B) and C)

Question 20

Which C4H9Br compound gives a triplet at approximately 3.5 ppm in the 1H NMR spectrum? 4H9Br compound gives a triplet at approximately 3.5 ppm in the 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) None of the above

Exam 13: Nuclear Magnetic Resonance Spectroscopy

How many signals appear in the proton-decoupled 13C NMR spectrum of 1,4-dibromobenzene?

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Which C4H9Br compound gives a triplet at approximately 3.5 ppm in the 1H NMR spectrum?

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What is the hydrogen deficiency index for a compound with a molecular formula of C6H11N?

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For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband hydrogen-decoupled 13C NMR spectra. Enter the numerical value in the blank provided to the left of the structure. -_______

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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 hydrogen deficiency index for a compound with a molecular formula of C10H16O2?

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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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Consider the compound shown below. The above compound would produce a signal further downfield in a 13C NMR spectrum than

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Which of the protons in the following molecule appear furthest downfield in the 1H NMR spectrum?

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Which of the following combinations of peaks appears in the 1H NMR spectrum of 2-methylpropane?

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What is the hydrogen deficiency index for a compound with a molecular formula of C6H6Br2?

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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 of the following compounds gives a 1H NMR spectrum consisting of only a singlet, triplet and quintet?

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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 C9H10O compound gives the following 1H NMR spectrum?

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Identify the compound (C8H10O2) that gives the following 1H NMR spectrum.

Correct Answerverified3-phenylpr...View AnswerShow Answer

How many sets of equivalent protons are there in 2-methylhexane?

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For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband hydrogen-decoupled 13C NMR spectra. Enter the numerical value in the blank provided to the left of the structure. -_______

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Which C6H12O2 compound gives the following 1H NMR spectrum?

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Which of the protons in the following molecule appear furthest downfield in the 1H NMR spectrum?

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How many signals appear in the proton-decoupled ¹³C NMR spectrum of 1,4-dibromobenzene?

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Which C₄H₉Br compound gives a triplet at approximately 3.5 ppm in the ¹H NMR spectrum?

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What is the hydrogen deficiency index for a compound with a molecular formula of C₆H₁₁N?

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For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband hydrogen-decoupled ¹³C NMR spectra. Enter the numerical value in the blank provided to the left of the structure. -_______

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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 hydrogen deficiency index for a compound with a molecular formula of C₁₀H₁₆O₂?

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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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Consider the compound shown below. The above compound would produce a signal further downfield in a ¹³C NMR spectrum than

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Which of the protons in the following molecule appear furthest downfield in the ¹H NMR spectrum?

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Which of the following combinations of peaks appears in the ¹H NMR spectrum of 2-methylpropane?

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What is the hydrogen deficiency index for a compound with a molecular formula of C₆H₆Br₂?

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Which of the following compounds gives a ¹H NMR spectrum consisting of only a singlet, triplet and quintet?

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Which C₉H₁₀O compound gives the following ¹H NMR spectrum?

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Identify the compound (C₈H₁₀O₂) that gives the following ¹H NMR spectrum.

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3-phenylpr...
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For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband hydrogen-decoupled ¹³C NMR spectra. Enter the numerical value in the blank provided to the left of the structure. -_______

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Which C₆H₁₂O₂ compound gives the following ¹H NMR spectrum?

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Which of the protons in the following molecule appear furthest downfield in the ¹H NMR spectrum?

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