Question 1

Which of the protons in the following molecule appear furthest downfield in the 1H NMR spectrum?  CH3−CH2−CH2−CH2−Cl\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{Cl}CH3​−CH2​−CH2​−CH2​−Cl 
 \quad i  \quad\quad\quad ii \quad\quad  iii  \quad\quad iv

Accepted Answer

A)   i
B)   ii
C)   iii
D)   iv E) C) and D)
F) None of the above

Question 2

Identify the type of coupling that exists between the two protons in the following compound, given that the compound is asymmetrical. ​

Accepted Answer

A)   Geminal coupling
B)   Vicinal coupling
C)   Long-range coupling
D)   Single-bond couplingE) None of the above
F) B) and C)

Question 3

What is the splitting of the signal in the 1H NMR spectrum for the methyl protons of ethane?

Accepted Answer

A)   singlet
B)   doublet
C)   triplet
D)   quartetE) A) and C)
F) C) and D)

Question 4

Which of the protons in the following molecule appear furthest downfield in the 1H NMR spectrum?  \quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad O
 \quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad ||
 H3C−O−CH2−CH2−C−H\mathrm{H}_{3} \mathrm{C}-\mathrm{O}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{C}-\mathrm{H}H3​C−O−CH2​−CH2​−C−H 
 \quad i \quad\quad\quad\quad\quad  ii \quad\quad  iii \quad\quad\quad  iv

Accepted Answer

A)   i
B)   ii
C)   iii
D)   iv E) A) and C)
F) A) and B)

Question 5

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

Question 6

Which of the following is not true regarding 1H NMR spectroscopy?

Accepted Answer

A)   a "downfield" peak appears at a lower value of δ
B)   on a 300 MHz instrument, a proton that adsorbs irradiation at a frequency 900 Hz higher than the adsorption of TMS appears at δ 3 ppm.
C)   δ for a particular proton is independent of the magnetic field strength of the instrument used.
D)   "deshielding" leads to peaks at higher values of δE) B) and D)
F) None of the above

Question 7

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) A) and D)

Question 8

Which C4H9Br compound gives a doublet at approximately 3.3 ppm in the 1H NMR spectrum? 4H9Br compound gives a doublet at approximately 3.3 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) B) and C)
F) A) and D)

Question 9

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

Accepted Answer

m-xylene (...

Question 10

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

Accepted Answer

Question 11

Which feature in the 1H NMR spectrum provides information about the electronic environment of the protons in a compound?

Accepted Answer

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

Question 12

Consider the following structure. Answer the following questions by placing the appropriate number in the blank to the left. 
-_____The number of signals in the hydrogen-decoupled 13C NMR of this compound.

Accepted Answer

Question 13

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 14

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 15

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

Question 16

Consider the following structure. Answer the following questions by placing the appropriate number in the blank to the left. 
-_____The number of nonequivalent hydrogen atoms in this compound.

Accepted Answer

The answer of Consider the following structure. Answer the following...

Question 17

Which of the following combinations of peaks appears in the 1H NMR spectrum of butane?

Accepted Answer

A)   a triplet and a doublet
B)   a triplet and a quartet
C)   a triplet and a sextet
D)   two singletsE) A) and D)
F) None of the above

Question 18

On which factor is chemical shielding not dependent?

Accepted Answer

A)   Hybridization of adjacent atoms
B)   Electronegativity of nearby atoms
C)   Karplus curve to plot dihedral angles
D)   Magnetic induction within an adjacent pi bondE) C) and D)
F) B) and C)

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

The splitting of signals in the 1H NMR spectrum provides information about the number of neighboring protons of each proton in the compound.

Accepted Answer

A) True 
 B)False

Exam 13: Nuclear Magnetic Resonance Spectroscopy

The splitting of signals in the ¹H NMR spectrum provides information about the number of neighboring protons of each proton in the compound.

Correct Answer
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On which factor is chemical shielding not dependent?

Correct Answer
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Which C₄H₉Br compound gives a doublet at approximately 3.3 ppm in the ¹H NMR spectrum?

Correct Answer
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Identify the type of coupling that exists between the two protons in the following compound, given that the compound is asymmetrical.

Correct Answer
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Which of the protons in the following molecule appear furthest downfield in the ¹H NMR spectrum? $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{Cl}$ $\quad$ i $\quad$ $\quad$ $\quad$ ii $\quad$ $\quad$ iii $\quad$ $\quad$ iv

Correct Answer
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Which feature in the ¹H NMR spectrum provides information about the electronic environment of the protons in a compound?

Correct Answer
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Correct Answer
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What is the splitting of the signal in the ¹H NMR spectrum for the methyl protons of ethane?

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

Correct Answer
verified

Which C₈H₁₀ compound gives the following ¹H NMR spectrum?

Correct Answer
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Which of the following is not true regarding ¹H NMR spectroscopy?

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

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

Correct Answer
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m-xylene (...
View Answer

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

Correct Answer
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Consider the following structure. Answer the following questions by placing the appropriate number in the blank to the left. -_____The number of nonequivalent hydrogen atoms in this compound.

Correct Answer
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Which of the following combinations of peaks appears in the ¹H NMR spectrum of butane?

Correct Answer
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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. -_______

Correct Answer
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Which C₉H₁₀O compound gives the following ¹H NMR spectrum?

Correct Answer
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Consider the following structure. Answer the following questions by placing the appropriate number in the blank to the left. -_____The number of signals in the hydrogen-decoupled ¹³C NMR of this compound.

Correct Answer
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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.

Correct Answer
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Exam 13: Nuclear Magnetic Resonance Spectroscopy

The splitting of signals in the 1H NMR spectrum provides information about the number of neighboring protons of each proton in the compound.

Correct AnswerverifiedShow Answer

On which factor is chemical shielding not dependent?

Correct AnswerverifiedShow Answer

Which C4H9Br compound gives a doublet at approximately 3.3 ppm in the 1H NMR spectrum?

Correct AnswerverifiedShow Answer

Identify the type of coupling that exists between the two protons in the following compound, given that the compound is asymmetrical. ​

Correct AnswerverifiedShow Answer

Which of the protons in the following molecule appear furthest downfield in the 1H NMR spectrum? CH3−CH2−CH2−CH2−Cl\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{Cl}CH3​−CH2​−CH2​−CH2​−Cl \quad i \quad\quad\quad ii \quad\quad iii \quad\quad iv

Correct AnswerverifiedShow Answer

Which feature in the 1H NMR spectrum provides information about the electronic environment of the protons in a compound?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the splitting of the signal in the 1H NMR spectrum for the methyl protons of ethane?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which C8H10 compound gives the following 1H NMR spectrum?

Correct AnswerverifiedShow Answer

Which of the following is not true regarding 1H NMR spectroscopy?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answerverifiedm-xylene (...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Consider the following structure. Answer the following questions by placing the appropriate number in the blank to the left. -_____The number of nonequivalent hydrogen atoms in this compound.

Correct AnswerverifiedShow Answer

Which of the following combinations of peaks appears in the 1H NMR spectrum of butane?

Correct AnswerverifiedShow Answer

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. -_______

Correct AnswerverifiedShow Answer

Which C9H10O compound gives the following 1H NMR spectrum?

Correct AnswerverifiedShow Answer

Consider the following structure. Answer the following questions by placing the appropriate number in the blank to the left. -_____The number of signals in the hydrogen-decoupled 13C NMR of this compound.

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

The splitting of signals in the ¹H NMR spectrum provides information about the number of neighboring protons of each proton in the compound.

Correct Answer
verified

Correct Answer
verified

Which C₄H₉Br compound gives a doublet at approximately 3.3 ppm in the ¹H NMR spectrum?

Correct Answer
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Identify the type of coupling that exists between the two protons in the following compound, given that the compound is asymmetrical.

Correct Answer
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Which of the protons in the following molecule appear furthest downfield in the ¹H NMR spectrum? $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{Cl}$ $\quad$ i $\quad$ $\quad$ $\quad$ ii $\quad$ $\quad$ iii $\quad$ $\quad$ iv

Correct Answer
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Which feature in the ¹H NMR spectrum provides information about the electronic environment of the protons in a compound?

Correct Answer
verified

Correct Answer
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What is the splitting of the signal in the ¹H NMR spectrum for the methyl protons of ethane?

Correct Answer
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Correct Answer
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Which C₈H₁₀ compound gives the following ¹H NMR spectrum?

Correct Answer
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Which of the following is not true regarding ¹H NMR spectroscopy?

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

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

Correct Answer
verified
m-xylene (...
View Answer

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

Correct Answer
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Correct Answer
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Which of the following combinations of peaks appears in the ¹H NMR spectrum of butane?

Correct Answer
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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. -_______

Correct Answer
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Which C₉H₁₀O compound gives the following ¹H NMR spectrum?

Correct Answer
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Consider the following structure. Answer the following questions by placing the appropriate number in the blank to the left. -_____The number of signals in the hydrogen-decoupled ¹³C NMR of this compound.

Correct Answer
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Correct Answer
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