Question 1

What is the multiplicity of the indicated hydrogen?

Accepted Answer

A)  singlet
B)  doublet
C)  triplet
D)  quartet

Question 2

12C is a NMR active nuclei.

Accepted Answer

A) True 
 B)False

Question 3

Predict the structure of a molecule with the formula C11H15NO from the 1H NMR and 13C NMR shown below.

Accepted Answer

The molecu...

Question 4

How many unique proton signals would be expected in a 1H NMR spectrum run in D2O? 1H NMR spectrum run in D2O?   A) 3 B) 4 C) 5 D) 6" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  3
B)  4
C)  5
D)  6

Question 5

Determine the expected multiplicity of the protons indicated at each point of the molecule shown below.

Accepted Answer

The multiplicities a...

Question 6

Which of the following best describes protons placed near electron withdrawing groups?

Accepted Answer

A)  They are shielded and upfield.
B)  They are shielded and downfield.
C)  They are deshielded and upfield.
D)  They are deshielded and downfield.

Question 7

Determine the types of signals of the carbons in a 13C DEPT 45 and 13C DEPT 135 spectrum of the following molecule.

Accepted Answer

The assignments are as follows...

Question 8

Predict the structure of a molecule with the formula C8H9Cl from the 1H NMR shown below and assign each peak.

Accepted Answer

The struct...

Question 9

What represents the integration ratio of peaks in the 1H NMR spectrum for the molecule shown below? 1H NMR spectrum for the molecule shown below?   A) 3:2:2:3 B) 3:1 C) 6:2:2 D) 3:3:1:1:1:1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  3:2:2:3
B)  3:1
C)  6:2:2
D)  3:3:1:1:1:1

Question 10

An NMR spectrum is a result of nuclei excitation.

Accepted Answer

A) True 
 B)False

Question 11

Nuclei in close proximity above the plane of an aromatic ring are shielded by anisotropy.

Accepted Answer

A) True 
 B)False

Question 12

A(n)_______________ in a 1H NMR spectrum represents a proton with four neighbours

Accepted Answer

Question 13

Which of the following molecules would have the most downfield signal in a 1H NMR?

Accepted Answer

A)  CH4
B)  CHCl3
C)  CHBr3
D)  CHF3

Question 14

What is the degree of unsaturation of a molecule with the molecular formula C9H13ClO3?

Accepted Answer

A)  1
B)  3
C)  5
D)  7

Question 15

How many positive signals would be expected in a 13C-DEPT-135 of the following molecule? 13C-DEPT-135 of the following molecule?   A) 5 B) 6 C) 7 D) 9" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  5
B)  6
C)  7
D)  9

Question 16

Which of the following best describes a 13C-DEPT-45 spectrum?

Accepted Answer

A)  Primary and tertiary carbons appear as positive signals.
B)  Primary and tertiary carbons appear as negative signals.
C)  Primary carbons appear as positive signals,and tertiary carbons appear as negative signals.
D)  Primary carbons appear as negative signals,and tertiary carbons appear as positive signals.

Question 17

A quartet in a 1H NMR spectrum represents a proton with four proton neighbours.

Accepted Answer

A) True 
 B)False

Question 18

A 13C-DEPT-90 spectrum produces positive signals for primary carbons.

Accepted Answer

A) True 
 B)False

Question 19

A 13C-DEPT-45 spectrum produces positive signals for tertiary carbons.

Accepted Answer

A) True 
 B)False

Question 20

Hydrogen bonding shields protons in 1H NMR spectra.

Accepted Answer

A) True 
 B)False

Exam 13: Structure Determination I

Determine the types of signals of the carbons in a 13C DEPT 45 and 13C DEPT 135 spectrum of the following molecule.

Correct AnswerverifiedThe assignments are as follows...View AnswerShow Answer

A(n)_______________ in a 1H NMR spectrum represents a proton with four neighbours

Correct AnswerverifiedShow Answer

Which of the following best describes protons placed near electron withdrawing groups?

Correct AnswerverifiedShow Answer

Determine the expected multiplicity of the protons indicated at each point of the molecule shown below.

Correct AnswerverifiedThe multiplicities a...View AnswerShow Answer

A 13C-DEPT-45 spectrum produces positive signals for tertiary carbons.

Correct AnswerverifiedShow Answer

What is the degree of unsaturation of a molecule with the molecular formula C9H13ClO3?

Correct AnswerverifiedShow Answer

Hydrogen bonding shields protons in 1H NMR spectra.

Correct AnswerverifiedShow Answer

Predict the structure of a molecule with the formula C8H9Cl from the 1H NMR shown below and assign each peak.

Correct AnswerverifiedThe struct...View AnswerShow Answer

What represents the integration ratio of peaks in the 1H NMR spectrum for the molecule shown below?

Correct AnswerverifiedShow Answer

Which of the following best describes a 13C-DEPT-45 spectrum?

Correct AnswerverifiedShow Answer

Predict the structure of a molecule with the formula C11H15NO from the 1H NMR and 13C NMR shown below.

Correct AnswerverifiedThe molecu...View AnswerShow Answer

How many unique proton signals would be expected in a 1H NMR spectrum run in D2O?

Correct AnswerverifiedShow Answer

Nuclei in close proximity above the plane of an aromatic ring are shielded by anisotropy.

Correct AnswerverifiedShow Answer

A quartet in a 1H NMR spectrum represents a proton with four proton neighbours.

Correct AnswerverifiedShow Answer

Which of the following molecules would have the most downfield signal in a 1H NMR?

Correct AnswerverifiedShow Answer

What is the multiplicity of the indicated hydrogen?

Correct AnswerverifiedShow Answer

An NMR spectrum is a result of nuclei excitation.

Correct AnswerverifiedShow Answer

12C is a NMR active nuclei.

Correct AnswerverifiedShow Answer

How many positive signals would be expected in a 13C-DEPT-135 of the following molecule?

Correct AnswerverifiedShow Answer

A 13C-DEPT-90 spectrum produces positive signals for primary carbons.

Correct AnswerverifiedShow Answer

Determine the types of signals of the carbons in a ¹³C DEPT 45 and ¹³C DEPT 135 spectrum of the following molecule.

Correct Answer
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The assignments are as follows...
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A(n)_______________ in a ¹H NMR spectrum represents a proton with four neighbours

Correct Answer
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Correct Answer
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Correct Answer
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The multiplicities a...
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A ¹³C-DEPT-45 spectrum produces positive signals for tertiary carbons.

Correct Answer
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What is the degree of unsaturation of a molecule with the molecular formula C₉H₁₃ClO₃?

Correct Answer
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Hydrogen bonding shields protons in ¹H NMR spectra.

Correct Answer
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Predict the structure of a molecule with the formula C₈H₉Cl from the ¹H NMR shown below and assign each peak.

Correct Answer
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The struct...
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What represents the integration ratio of peaks in the ¹H NMR spectrum for the molecule shown below?

Correct Answer
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Which of the following best describes a ¹³C-DEPT-45 spectrum?

Correct Answer
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Predict the structure of a molecule with the formula C₁₁H₁₅NO from the ¹H NMR and ¹³C NMR shown below.

Correct Answer
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The molecu...
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How many unique proton signals would be expected in a ¹H NMR spectrum run in D₂O?

Correct Answer
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Correct Answer
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A quartet in a ¹H NMR spectrum represents a proton with four proton neighbours.

Correct Answer
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Which of the following molecules would have the most downfield signal in a ¹H NMR?

Correct Answer
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Correct Answer
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Correct Answer
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¹²C is a NMR active nuclei.

Correct Answer
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How many positive signals would be expected in a ¹³C-DEPT-135 of the following molecule?

Correct Answer
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A ¹³C-DEPT-90 spectrum produces positive signals for primary carbons.

Correct Answer
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