Question 1

Which of the following is true for pair of diastereotopic 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 2

Question 2

Identify the compound (C4H6O2) that gives the following 1H NMR spectrum.

Accepted Answer

methyl pro...

Question 3

Which feature in the 1H NMR spectrum provides information about the number of types of different protons in a compound?

Accepted Answer

A)  number of signals
B)  integral
C)  splitting
D)  chemical shift

Question 4

How many signals appear in the proton-decoupled 13C NMR spectrum of 1,3-dibromobenzene?

Accepted Answer

A)  1
B)  2
C)  3
D)  4

Question 5

Which of the protons in the following molecule appear at the highest  δ\deltaδ -value 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)  iv

Question 6

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)  iv

Question 7

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

Accepted Answer

A)  "shielding" leads to peaks at lower values of   σ\sigmaσ 
B)  a "downfield" peak appears at a higher value of   σ\sigmaσ 
C)  "  σ\sigmaσ  for a particular proton depends on the magnetic field strength of the instrument used."
D)  on a 300 MHz instrument, a proton that adsorbs irradiation at a frequency 1200 Hz higher than the adsorption of TMS appears at   σ\sigmaσ  4 ppm.

Question 8

Which of the carbon atoms in the molecule appears furthest downfield in the 13C NMR spectrum? 13C 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)  iv

Question 9

MATCHING
The following questions pertain to the display of NMR spectra. Match a term to each description below.
-The vertical axis of spectrum displays the _____ of the signal.

Accepted Answer

A)  TMS
B)  high-field or upfield side
C)  MHz
D)  delta ( δ\deltaδ ) 
E)  low-field or downfield sideF) chemical shiftG) intensity

Question 10

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

Accepted Answer

A)  a "downfield" peak appears at a lower value of   δ\deltaδ 
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\deltaδ  3 ppm.
C)  " δ\deltaδ  for a particular proton is independent of the magnetic field strength of the instrument used."
D)  "deshielding" leads to peaks at higher values of  δ\deltaδ

Question 11

Identify the compound (C3H7Cl) that gives the following 1H NMR spectrum.

Accepted Answer

Question 12

Which of the protons in the following molecule appear at the highest  δ\deltaδ -value 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)  iv

Question 13

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

Question 14

MATCHING
The following questions pertain to the display of NMR spectra. Match a term to each description below.
-When looking at a NMR spectrum the right-hand part of the chart is the _____.

Accepted Answer

A)  TMS
B)  high-field or upfield side
C)  MHz
D)  delta ( δ\deltaδ ) 
E)  low-field or downfield sideF) chemical shiftG) intensity

Question 15

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 16

Which of the protons in the following molecule appear at the highest  δ\deltaδ -value 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)  iv

Question 17

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

Accepted Answer

A)  3
B)  4
C)  5
D)  7

Question 18

How many signals appear in the proton-decoupled 13C NMR spectrum of 2-bromotoluene?

Accepted Answer

A)  3
B)  4
C)  5
D)  7

Question 19

Identify the ratio of peak areas upon integration of the 1H NMR spectrum for A, B, and C respectively. Enter the numbers separated by colons.

Accepted Answer

Question 20

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

Accepted Answer

Exam 13: Nuclear Magnetic Resonance Spectroscopy

Which feature in the 1H NMR spectrum provides information about the number of types of different protons in a compound?

Correct AnswerverifiedShow Answer

Which of the protons in the following molecule appear at the highest δ\deltaδ -value in the 1H NMR spectrum?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the carbon atoms in the molecule appears furthest downfield in the 13C NMR spectrum?

Correct AnswerverifiedShow Answer

Identify the ratio of peak areas upon integration of the 1H NMR spectrum for A, B, and C respectively. Enter the numbers separated by colons.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Identify the compound (C3H7Cl) that gives the following 1H NMR spectrum.

Correct AnswerverifiedShow Answer

MATCHING The following questions pertain to the display of NMR spectra. Match a term to each description below. -When looking at a NMR spectrum the right-hand part of the chart is the _____.

Correct AnswerverifiedShow Answer

Identify the compound (C4H6O2) that gives the following 1H NMR spectrum.

Correct Answerverifiedmethyl pro...View AnswerShow Answer

Which of the protons in the following molecule appear at the highest δ\deltaδ -value in the 1H NMR spectrum?

Correct AnswerverifiedShow Answer

MATCHING The following questions pertain to the display of NMR spectra. Match a term to each description below. -The vertical axis of spectrum displays the _____ of the signal.

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 AnswerverifiedShow Answer

Which of the protons in the following molecule appear at the highest δ\deltaδ -value in the 1H NMR spectrum?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How many signals appear in the proton-decoupled 13C NMR spectrum of 2-bromotoluene?

Correct AnswerverifiedShow Answer

Which of the following is true for pair of diastereotopic 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

Correct AnswerverifiedShow Answer

How many signals appear in the proton-decoupled 13C NMR spectrum of 1,3-dibromobenzene?

Correct AnswerverifiedShow Answer

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 AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which feature in the ¹H NMR spectrum provides information about the number of types of different protons in a compound?

Correct Answer
verified

Which of the protons in the following molecule appear at the highest $\delta$ -value in the ¹H NMR spectrum? $Which of the protons in the following molecule appear at the highest \delta -value in the <sup>1</sup>H NMR spectrum? A) i B) ii C) iii D) iv$

Correct Answer
verified

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

Correct Answer
verified

Which of the carbon atoms in the molecule appears furthest downfield in the ¹³C NMR spectrum?

Correct Answer
verified

Identify the ratio of peak areas upon integration of the ¹H NMR spectrum for A, B, and C respectively. Enter the numbers separated by colons.

Correct Answer
verified

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

Correct Answer
verified

Identify the compound (C₃H₇Cl) that gives the following ¹H NMR spectrum.

Correct Answer
verified

Correct Answer
verified

Identify the compound (C₄H₆O₂) that gives the following ¹H NMR spectrum.

Correct Answer
verified
methyl pro...
View Answer

Which of the protons in the following molecule appear at the highest $\delta$ -value in the ¹H NMR spectrum? $Which of the protons in the following molecule appear at the highest \delta -value in the <sup>1</sup>H NMR spectrum? A) i B) ii C) iii D) iv$

Correct Answer
verified

Correct Answer
verified

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

Which of the protons in the following molecule appear at the highest $\delta$ -value in the ¹H NMR spectrum? $Which of the protons in the following molecule appear at the highest \delta -value in the <sup>1</sup>H NMR spectrum? A) i B) ii C) iii D) iv$

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

How many signals appear in the proton-decoupled ¹³C NMR spectrum of 2-bromotoluene?

Correct Answer
verified

Correct Answer
verified

How many signals appear in the proton-decoupled ¹³C NMR spectrum of 1,3-dibromobenzene?

Correct Answer
verified

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
verified

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

Correct Answer
verified