Question 1

The chemical shift of the protons of acetone, CH3COCH3, is 2.1 ppm when the spectrum is obtained at 250 MHz. What is the chemical shift of these protons when the spectrum is acquired at 500 MHz?

Accepted Answer

A)  1.05 ppm
B)  2.1 ppm
C)  4.2 ppm
D)  8.4 ppmE) None of the above
F) C) and D)

Question 2

What is the appearance of the signal corresponding to the CH2 protons in the 1H NMR spectrum of ethyl methyl ether, CH3CH2OCH3?

Accepted Answer

A)  a doublet
B)  a triplet
C)  a quartet
D)  a septetE) A) and B)
F) B) and C)

Question 3

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

Accepted Answer

o-xylene (...

Question 4

Which of the following compounds gives a 1H NMR spectrum consisting of two singlets and a 13C NMR consisting of consisting of three signals? 1H NMR spectrum consisting of two singlets and a 13C NMR consisting of consisting of three signals?   A) only i B) only iii C) only ii and iii D) only ii, iii and iv" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  only i
B)  only iii
C)  only ii and iii
D)  only ii, iii and ivE) C) and D)
F) A) and B)

Question 5

Nuclear magnetic resonance spectroscopy provides information about a molecule's carbon-hydrogen framework.

Accepted Answer

A) True 
 B)False

Question 6

How many signals appear in the proton-decoupled 13C NMR spectrum of the following compound? 13C NMR spectrum of the following compound?   A) 7 B) 8 C) 9 D) 11" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  7
B)  8
C)  9
D)  11E) A) and B)
F) C) and D)

Question 7

Which feature in the 1H NMR spectrum provides information about the relative number of each type of proton in a compound?

Accepted Answer

A)  number of signals
B)  integral
C)  splitting
D)  chemical shiftE) All of the above
F) A) and B)

Question 8

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

Question 9

Consider the following structure.  If the proton attached to C2 in 1,1,2-tribromopropane is coupled with the protons on C1 (J = 3.6 Hz) and C3 (J = 6.8), the tree diagram of the C2 proton is shown below.

Accepted Answer

A) True 
 B)False

Question 10

How many signals appear in the proton-decoupled 13C NMR spectrum of the following compound? 13C NMR spectrum of the following compound?   A) 6 B) 7 C) 8 D) 11" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  6
B)  7
C)  8
D)  11E) B) and D)
F) B) and C)

Question 11

Predict the splitting of each of the numbered hydrogen atoms in the structure below in a S1U1P11S1S1P0H NMR spectrum. Identify as singlet, doublet, triplet, quartet, quintet, sextet, septet, .... Place the correct splitting in the blank to the left of the number. 
-______ 1

Accepted Answer

The answer of Predict the splitting of each of the...

Question 12

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

Question 13

What is the hydrogen deficiency index for a compound with a molecular formula of C12H16O?

Accepted Answer

A)  2
B)  4
C)  5
D)  6E) All of the above
F) B) and D)

Question 14

Which of the following compounds have enantiotopic protons?
1) propane
2) butane
3) 2-methylpropane

Accepted Answer

A)  only 1
B)  only 2
C)  only 1 and 2
D)  1, 2 and 3E) A) and D)
F) B) and C)

Question 15

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

Accepted Answer

A)  singlet
B)  doublet
C)  triplet
D)  nonetE) A) and B)
F) None of the above

Question 16

Which of the following compounds would give a 1H NMR spectrum consisting of two singlets and a 13C NMR consisting of consisting of three signals? 1H NMR spectrum consisting of two singlets and a 13C NMR consisting of consisting of three signals?   A) only i B) only iii C) only i and iii D) iii and iv" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  only i
B)  only iii
C)  only i and iii
D)  iii and ivE) A) and B)
F) None of the above

Question 17

The following compound will have a 1H NMR spectrum that consists of:  two triplets and a singlet, area ratio 3:3:4.

Accepted Answer

A) True 
 B)False

Question 18

Identify the compound (C8H11N) that gives the following 1H NMR spectrum.

Accepted Answer

1-phenylet...

Question 19

What is the relative area of the six peaks in a sexet in an 1H NMR spectrum?

Accepted Answer

A)  1:2:3:3:2:1
B)  1:3:6:6:3:1
C)  1:5:10:10:5:1
D)  1:6:15:15:6:1E) B) and D)
F) A) and C)

Question 20

How many signals appear in proton-decoupled 13C NMR spectrum of 2,5-dimethylhexane?

Accepted Answer

A)  3
B)  4
C)  5
D)  6E) B) and C)
F) None of the above

Exam 13: Nuclear Magnetic Resonance Spectroscopy

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

Correct AnswerverifiedShow Answer

How many signals appear in the proton-decoupled 13C NMR spectrum of the following compound?

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The following compound will have a 1H NMR spectrum that consists of: two triplets and a singlet, area ratio 3:3:4.

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What is the relative area of the six peaks in a sexet in an 1H NMR spectrum?

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Which of the following compounds gives a 1H NMR spectrum consisting of two singlets and a 13C NMR consisting of consisting of three signals?

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

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Consider the following structure. If the proton attached to C2 in 1,1,2-tribromopropane is coupled with the protons on C1 (J = 3.6 Hz) and C3 (J = 6.8), the tree diagram of the C2 proton is shown below.

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The chemical shift of the protons of acetone, CH3COCH3, is 2.1 ppm when the spectrum is obtained at 250 MHz. What is the chemical shift of these protons when the spectrum is acquired at 500 MHz?

Correct AnswerverifiedShow Answer

Nuclear magnetic resonance spectroscopy provides information about a molecule's carbon-hydrogen framework.

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Predict the splitting of each of the numbered hydrogen atoms in the structure below in a 1H NMR spectrum. Identify as singlet, doublet, triplet, quartet, quintet, sextet, septet, .... Place the correct splitting in the blank to the left of the number. -______ 1

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How many signals appear in the proton-decoupled 13C NMR spectrum of the following compound?

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How many signals appear in proton-decoupled 13C NMR spectrum of 2,5-dimethylhexane?

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What is the hydrogen deficiency index for a compound with a molecular formula of C12H16O?

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Which of the following compounds would give a 1H NMR spectrum consisting of two singlets and a 13C NMR consisting of consisting of three signals?

Correct AnswerverifiedShow Answer

Which of the following compounds have enantiotopic protons? 1) propane 2) butane 3) 2-methylpropane

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Identify the compound (C8H11N) that gives the following 1H NMR spectrum.

Correct Answerverified1-phenylet...View AnswerShow Answer

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

Correct Answerverifiedo-xylene (...View AnswerShow Answer

What is the appearance of the signal corresponding to the CH2 protons in the 1H NMR spectrum of ethyl methyl ether, CH3CH2OCH3?

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

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Which feature in the 1H NMR spectrum provides information about the relative number of each type of proton in a compound?

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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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How many signals appear in the proton-decoupled ¹³C NMR spectrum of the following compound?

Correct Answer
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The following compound will have a ¹H NMR spectrum that consists of: two triplets and a singlet, area ratio 3:3:4.

Correct Answer
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What is the relative area of the six peaks in a sexet in an ¹H NMR spectrum?

Correct Answer
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Which of the following compounds gives a ¹H NMR spectrum consisting of two singlets and a ¹³C NMR consisting of consisting of three signals?

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

Correct Answer
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The chemical shift of the protons of acetone, CH₃COCH₃, is 2.1 ppm when the spectrum is obtained at 250 MHz. What is the chemical shift of these protons when the spectrum is acquired at 500 MHz?

Correct Answer
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Correct Answer
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Predict the splitting of each of the numbered hydrogen atoms in the structure below in a ¹H NMR spectrum. Identify as singlet, doublet, triplet, quartet, quintet, sextet, septet, .... Place the correct splitting in the blank to the left of the number. -______ 1

Correct Answer
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How many signals appear in the proton-decoupled ¹³C NMR spectrum of the following compound?

Correct Answer
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How many signals appear in proton-decoupled ¹³C NMR spectrum of 2,5-dimethylhexane?

Correct Answer
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What is the hydrogen deficiency index for a compound with a molecular formula of C₁₂H₁₆O?

Correct Answer
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Which of the following compounds would give a ¹H NMR spectrum consisting of two singlets and a ¹³C NMR consisting of consisting of three signals?

Correct Answer
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Correct Answer
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Identify the compound (C₈H₁₁N) that gives the following ¹H NMR spectrum.

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

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o-xylene (...
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What is the appearance of the signal corresponding to the CH₂ protons in the ¹H NMR spectrum of ethyl methyl ether, CH₃CH₂OCH₃?

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

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Which feature in the ¹H NMR spectrum provides information about the relative number of each type of proton in a compound?

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