Question 1

Predict the number of signals expected (disregarding splitting) in the 1H spectrum of 1,1-dimethylcyclobutane.

Accepted Answer

Question 2

Deduce the identity of the following compound from the 1H NMR data given.
C6H10O2: δ 2.19 (3H, singlet), 2.70 (2H, singlet) (ppm)

Accepted Answer

Question 3

Deduce the identity of the following compound from the 1H NMR data given.
C5H12O: δ 1.0 (3H, triplet), 1.2-1.8 (6H, multiplet), 3.0 (1H, broad singlet), 3.8 (2H, triplet) (ppm)

Accepted Answer

Question 4

What compound exhibits three singlets in its proton spin decoupled 13C NMR spectrum?

Accepted Answer

A)   BrCH2CH2CH2Br
B)   BrCH2CH2CH2Cl
C)   (CH3) 2CHCH(CH3) 2
D)   CH3CH2CH2CH3
E)   (CH3) 2CHOCH(CH3) 2

Question 5

Provide a structure that is consistent with the data below.
C7H16O
IR (cm-1): 3200-3600 (broad), 2950
1H NMR ( d): 2.9 (1H, broad s), 1.2 (6H, q), 0.9 (9H, t)
13C NMR (d ): 70 (s), 25 (t), 12 (q)

Accepted Answer

Question 6

Calculate the magnetic field that corresponds to the proton resonance frequency of 300.00 MHz. The gyromagnetic ratio of the 1H nucleus is 26,753 s-1 gauss-1.

Accepted Answer

Question 7

The following splitting pattern represents one of the vinyl protons of styrene. Identify which proton is represented and list all the coupling constants (J values) for the splitting pattern.

Accepted Answer

Hb, Jab = ...

Question 8

Predict the number of signals expected (disregarding splitting) in the 1H NMR spectrum of the compound shown below.

Accepted Answer

Question 9

Deduce the identity of the following compound from the 1H NMR data given.
C7H12O4: δ 1.3 (6H, triplet), 3.4 (2H, singlet), 4.2 (4H, quartet) (ppm)

Accepted Answer

CH₂(CO₂CH₂CH₃)₂

Question 10

Deduce the identity of the compound whose molecular formula is C4H8O3 from the spectral data provided: IR (cm-1): 2800-3300 (broad), 2950, 1750; 13C NMR (δ): 17.7 (q), 65.4 (q), 72.3 (d), 210.8 (s) (ppm)

Accepted Answer

CH₃OCH(CH₃)CO₂H

Question 11

Predict the number of signals expected in the proton spin decoupled 13C NMR spectrum of the compound shown below.

Accepted Answer

Question 12

Provide a structure that is consistent with the data below.
C5H10O
IR (cm-1): 2950
1H NMR ( d): 3.5 (4H, s), 0.9 (6H, s)
13C NMR (d ): 64 (t), 41 (s), 12 (q)

Accepted Answer

Question 13

Which of the following functional groups has the most deshielded proton and would be predicted to show an NMR signal that is the farthest downfield?

Accepted Answer

A)   benzylic - H
B)   allylic - H
C)   aldehyde - H
D)   aromatic - H
E)   acetylenic - H

Question 14

In the presence of an external magnetic field the approximate ratio of 1H nuclei with α spins compared to β spins is respectively: ________.

Accepted Answer

A)   90:10
B)   25:75
C)   50:50
D)   75:25 C

Question 15

Deduce the identity of the following compound from the 1H NMR data given.
C3H6Br2: δ 2.4 (2H, quintet), 3.5 (4H, triplet) (ppm)

Accepted Answer

Question 16

Predict the number of signals expected, their splitting, and their relative area in the 1H NMR spectrum of 1,2-dichloroethane (ClCH2CH2Cl).

Accepted Answer

Question 17

Predict the number of signals expected (disregarding splitting) in the 1H spectrum of dibutyl ether.

Accepted Answer

Question 18

The protons marked Ha and Hb in the molecule below are ________. a and Hb in the molecule below are ________.   A)  chemically equivalent B)  enantiotopic C)  diastereotopic D)  endotopic E)  none of the above" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   chemically equivalent
B)   enantiotopic
C)   diastereotopic
D)   endotopic
E)   none of the above

Question 19

A peak split into a doublet of triplets gave the following measurements in its splitting
pattern. State the coupling constants (J values) for both the doublet and the triplet.

Accepted Answer

doublet: J...

Question 20

How many peaks appear in the proton spin decoupled 13 C NMR spectrum of the compound below? 13 C NMR spectrum of the compound below?   A)  1 B)  2 C)  3 D)  4 E)  5" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5

Exam 13: Nuclear Magnetic Resonance Spectroscopy

Predict the number of signals expected (disregarding splitting) in the 1H spectrum of 1,1-dimethylcyclobutane.

Correct AnswerverifiedShow Answer

Deduce the identity of the following compound from the 1H NMR data given. C6H10O2: δ 2.19 (3H, singlet), 2.70 (2H, singlet) (ppm)

Correct AnswerverifiedShow Answer

Deduce the identity of the following compound from the 1H NMR data given. C5H12O: δ 1.0 (3H, triplet), 1.2-1.8 (6H, multiplet), 3.0 (1H, broad singlet), 3.8 (2H, triplet) (ppm)

Correct AnswerverifiedShow Answer

What compound exhibits three singlets in its proton spin decoupled 13C NMR spectrum?

Correct AnswerverifiedShow Answer

Provide a structure that is consistent with the data below. C7H16O IR (cm-1): 3200-3600 (broad), 2950 1H NMR ( d): 2.9 (1H, broad s), 1.2 (6H, q), 0.9 (9H, t) 13C NMR (d ): 70 (s), 25 (t), 12 (q)

Correct AnswerverifiedShow Answer

Calculate the magnetic field that corresponds to the proton resonance frequency of 300.00 MHz. The gyromagnetic ratio of the 1H nucleus is 26,753 s-1 gauss-1.

Correct AnswerverifiedShow Answer

The following splitting pattern represents one of the vinyl protons of styrene. Identify which proton is represented and list all the coupling constants (J values) for the splitting pattern.

Correct AnswerverifiedHb, Jab = ...View AnswerShow Answer

Predict the number of signals expected (disregarding splitting) in the 1H NMR spectrum of the compound shown below.

Correct AnswerverifiedShow Answer

Deduce the identity of the following compound from the 1H NMR data given. C7H12O4: δ 1.3 (6H, triplet), 3.4 (2H, singlet), 4.2 (4H, quartet) (ppm)

Correct AnswerverifiedCH2(CO2CH2CH3)2

Deduce the identity of the compound whose molecular formula is C4H8O3 from the spectral data provided: IR (cm-1): 2800-3300 (broad), 2950, 1750; 13C NMR (δ): 17.7 (q), 65.4 (q), 72.3 (d), 210.8 (s) (ppm)

Correct AnswerverifiedCH3OCH(CH3)CO2H

Predict the number of signals expected in the proton spin decoupled 13C NMR spectrum of the compound shown below.

Correct AnswerverifiedShow Answer

Provide a structure that is consistent with the data below. C5H10O IR (cm-1): 2950 1H NMR ( d): 3.5 (4H, s), 0.9 (6H, s) 13C NMR (d ): 64 (t), 41 (s), 12 (q)

Correct AnswerverifiedShow Answer

Which of the following functional groups has the most deshielded proton and would be predicted to show an NMR signal that is the farthest downfield?

Correct AnswerverifiedShow Answer

In the presence of an external magnetic field the approximate ratio of 1H nuclei with α spins compared to β spins is respectively: ________.

Correct AnswerverifiedC

Deduce the identity of the following compound from the 1H NMR data given. C3H6Br2: δ 2.4 (2H, quintet), 3.5 (4H, triplet) (ppm)

Correct AnswerverifiedShow Answer

Predict the number of signals expected, their splitting, and their relative area in the 1H NMR spectrum of 1,2-dichloroethane (ClCH2CH2Cl).

Correct AnswerverifiedShow Answer

Predict the number of signals expected (disregarding splitting) in the 1H spectrum of dibutyl ether.

Correct AnswerverifiedShow Answer

The protons marked Ha and Hb in the molecule below are ________.

Correct AnswerverifiedShow Answer

A peak split into a doublet of triplets gave the following measurements in its splitting pattern. State the coupling constants (J values) for both the doublet and the triplet.

Correct Answerverifieddoublet: J...View AnswerShow Answer

How many peaks appear in the proton spin decoupled 13 C NMR spectrum of the compound below?

Correct AnswerverifiedShow Answer

Predict the number of signals expected (disregarding splitting) in the ¹H spectrum of 1,1-dimethylcyclobutane.

Correct Answer
verified

Deduce the identity of the following compound from the ¹H NMR data given. C₆H₁₀O₂: δ 2.19 (3H, singlet), 2.70 (2H, singlet) (ppm)

Correct Answer
verified

Deduce the identity of the following compound from the ¹H NMR data given. C₅H₁₂O: δ 1.0 (3H, triplet), 1.2-1.8 (6H, multiplet), 3.0 (1H, broad singlet), 3.8 (2H, triplet) (ppm)

Correct Answer
verified

What compound exhibits three singlets in its proton spin decoupled ¹³C NMR spectrum?

Correct Answer
verified

Provide a structure that is consistent with the data below. C₇H₁₆O IR (cm^-1): 3200-3600 (broad), 2950 ¹H NMR ( d): 2.9 (1H, broad s), 1.2 (6H, q), 0.9 (9H, t) ¹³C NMR (d ): 70 (s), 25 (t), 12 (q)

Correct Answer
verified

Calculate the magnetic field that corresponds to the proton resonance frequency of 300.00 MHz. The gyromagnetic ratio of the ¹H nucleus is 26,753 s^-1 gauss^-1.

Correct Answer
verified

Correct Answer
verified
Hb, Jab = ...
View Answer

Predict the number of signals expected (disregarding splitting) in the ¹H NMR spectrum of the compound shown below.

Correct Answer
verified

Deduce the identity of the following compound from the ¹H NMR data given. C₇H₁₂O₄: δ 1.3 (6H, triplet), 3.4 (2H, singlet), 4.2 (4H, quartet) (ppm)

Correct Answer
verified
CH₂(CO₂CH₂CH₃)₂

Deduce the identity of the compound whose molecular formula is C₄H₈O₃ from the spectral data provided: IR (cm^-1): 2800-3300 (broad), 2950, 1750; ¹³C NMR (δ): 17.7 (q), 65.4 (q), 72.3 (d), 210.8 (s) (ppm)

Correct Answer
verified
CH₃OCH(CH₃)CO₂H

Predict the number of signals expected in the proton spin decoupled ¹³C NMR spectrum of the compound shown below.

Correct Answer
verified

Provide a structure that is consistent with the data below. C₅H₁₀O IR (cm^-1): 2950 ¹H NMR ( d): 3.5 (4H, s), 0.9 (6H, s) ¹³C NMR (d ): 64 (t), 41 (s), 12 (q)

Correct Answer
verified

Correct Answer
verified

In the presence of an external magnetic field the approximate ratio of ¹H nuclei with α spins compared to β spins is respectively: ________.

Correct Answer
verified
C

Deduce the identity of the following compound from the ¹H NMR data given. C₃H₆Br₂: δ 2.4 (2H, quintet), 3.5 (4H, triplet) (ppm)

Correct Answer
verified

Predict the number of signals expected, their splitting, and their relative area in the ¹H NMR spectrum of 1,2-dichloroethane (ClCH₂CH₂Cl).

Correct Answer
verified

Predict the number of signals expected (disregarding splitting) in the ¹H spectrum of dibutyl ether.

Correct Answer
verified

The protons marked H_a and H_b in the molecule below are ________.

Correct Answer
verified

Correct Answer
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doublet: J...
View Answer

How many peaks appear in the proton spin decoupled ¹³C NMR spectrum of the compound below?

Correct Answer
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