Question 1

An NMR spectrum is a result of nuclei excitation.

Accepted Answer

A) True 
 B)False

Question 2

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 3

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

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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 6

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

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

The multiplicities a...

Question 8

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 9

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 10

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 11

12C is a NMR active nuclei.

Accepted Answer

A) True 
 B)False

Question 12

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 13

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 14

Hydrogen bonding shields protons in 1H NMR spectra.

Accepted Answer

A) True 
 B)False

Question 15

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 16

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

Accepted Answer

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

What is the multiplicity of the indicated hydrogen?

Accepted Answer

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

Question 19

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

Accepted Answer

The molecu...

Question 20

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

Exam 13: Structure Determination I

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

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedThe multiplicities a...View AnswerShow Answer

Hydrogen bonding shields protons in 1H NMR spectra.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow 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?

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

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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

What is the multiplicity of the indicated hydrogen?

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

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

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

12C is a NMR active nuclei.

Correct AnswerverifiedShow Answer

An NMR spectrum is a result of nuclei excitation.

Correct AnswerverifiedShow Answer

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

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

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

Correct AnswerverifiedShow Answer

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-45 spectrum produces positive signals for tertiary carbons.

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

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

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

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

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The assignments are as follows...
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Which of the following molecules would have the most downfield signal in a ¹H NMR?

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

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

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The molecu...
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¹²C is a NMR active nuclei.

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

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

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

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

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