Question 1

Predict the number of signals expected in the proton spin decoupled 13C spectrum of m-dichlorobenzene (1,3-dichlorobenzene).

Accepted Answer

Question 2

Which compound generates positive peaks for the carbonyl in both its DEPT-90 and DEPT-135 spectra?

Accepted Answer

A)   CH3CH2CHO
B)   CH3CH2COCH3
C)   CH3CO2CH2CH3
D)   CH3CH2CONH2
E)   H2CO

Question 3

Deduce the identity of the following compound from the spectral data given.
C7H10O2: 1H NMR, δ 1.16 (3H, singlet), 2.21 (2H, singlet); 13C NMR, δ 216.25 (singlet), 52.57 (singlet), 34.51 (triplet), 20.22 (quartet) (ppm)

Accepted Answer

2,2-dimeth...

Question 4

Using a 60-MHz spectrometer, the protons in dichloromethane appear at 5.30 ppm. When the same sample is placed in a 100-MHz instrument, where does the signal appear?

Accepted Answer

A)   8.33
B)   5.30
C)   3.18
D)   cannot be determined from information given

Question 5

Deduce the identity of the following compound from the 13C NMR data given.
C4H8O: δ 11.97 (triplet), 33.54 (triplet), 67.03 (doublet) (ppm)

Accepted Answer

Question 6

Using the scale below, draw the 1H NMR spectrum for isobutyl acetate, shown below. Present the peaks with correct splitting patterns and at the approximate chemical shift (+/- 0.5 ppm). Just above each peak, indicate the relative integration value of each type of hydrogen.

Accepted Answer

δ 3.9 ppm (d, 2H), 2...

Question 7

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

Accepted Answer

Question 8

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

Accepted Answer

Question 9

Predict the number of signals expected in the proton spin decoupled 13C spectrum of cyclopentane.

Accepted Answer

Question 10

Deduce the identity of the following compound from the 1H NMR data given.
C7H7NO3: δ 3.9 (3H, singlet), 6.9 (2H, doublet), 8.1 (2H, doublet) (ppm)

Accepted Answer

p-nitroani...

Question 11

Deduce the identity of the following compound from the spectral data given.
C9H10O2: 13C NMR, δ 18.06 (quartet), 45.40 (doublet), 127.32 (doublet), 127.55 (doublet), 128.61 (doublet), 139.70 (singlet) (ppm), 180.98 (singlet); IR, broad 3500-2800,

Accepted Answer

Question 12

Deduce the identity of the following compound from the 1H NMR data given.
C8H18O: δ 0.89 (6H, doublet), 1.87 (1H, multiplet), 3.17 (2H, doublet)(ppm)

Accepted Answer

Question 13

Why is carbon-hydrogen splitting not a major part of 1H NMR spectra?

Accepted Answer

Most of the carbons ...

Question 14

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

Accepted Answer

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

Question 15

Deduce the identity of the following compound from the 13C NMR data given.
C4H10O: δ 10.0 (quartet), 22.9 (quartet), 32.0 (triplet), 69.6 (doublet) (ppm)

Accepted Answer

Question 16

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

Accepted Answer

2 signals:...

Question 17

Any process faster than ________ will be recorded as an average by NMR spectroscopy.

Accepted Answer

A)   0.0005 seconds
B)   0.1 seconds
C)   0.01 seconds
D)   0.001 seconds
E)   1 minute

Question 18

Deduce the identity of the following compound from the spectral data given.
C4H8O2: 1H NMR, δ 1.23 (3H, triplet), 2.00 (3H, singlet), 4.02 (2H, quartet) (ppm); IR, 2980,

Accepted Answer

Question 19

Deduce the identity of the following compound from the spectral data given.
C3H4BrN: 1H NMR, δ 2.98 (2H, triplet), 3.53 (2H, triplet); 13C NMR, δ 21.05 (triplet), 23.87 (triplet), 118.08 (singlet) (ppm); IR, 2963,

Accepted Answer

Question 20

1H nuclei located near electronegative atoms tend to be ________ relative to 1H nuclei which are not.

Accepted Answer

A)   shielded
B)   deshielded
C)   resonanced
D)   split
E)   none of the above

Exam 13: Nuclear Magnetic Resonance Spectroscopy

Deduce the identity of the following compound from the 1H NMR data given. C8H18O: δ 0.89 (6H, doublet), 1.87 (1H, multiplet), 3.17 (2H, doublet)(ppm)

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Deduce the identity of the following compound from the 1H NMR data given. C7H7NO3: δ 3.9 (3H, singlet), 6.9 (2H, doublet), 8.1 (2H, doublet) (ppm)

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

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Predict the number of signals expected in the proton spin decoupled 13C spectrum of cyclopentane.

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Deduce the identity of the following compound from the spectral data given. C4H8O2: 1H NMR, δ 1.23 (3H, triplet), 2.00 (3H, singlet), 4.02 (2H, quartet) (ppm); IR, 2980,

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Predict the number of signals expected in the proton spin decoupled 13C spectrum of m-dichlorobenzene (1,3-dichlorobenzene).

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Which compound generates positive peaks for the carbonyl in both its DEPT-90 and DEPT-135 spectra?

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Deduce the identity of the following compound from the 13C NMR data given. C4H10O: δ 10.0 (quartet), 22.9 (quartet), 32.0 (triplet), 69.6 (doublet) (ppm)

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Deduce the identity of the following compound from the spectral data given. C3H4BrN: 1H NMR, δ 2.98 (2H, triplet), 3.53 (2H, triplet); 13C NMR, δ 21.05 (triplet), 23.87 (triplet), 118.08 (singlet) (ppm); IR, 2963,

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Deduce the identity of the following compound from the spectral data given. C9H10O2: 13C NMR, δ 18.06 (quartet), 45.40 (doublet), 127.32 (doublet), 127.55 (doublet), 128.61 (doublet), 139.70 (singlet) (ppm), 180.98 (singlet); IR, broad 3500-2800,

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Why is carbon-hydrogen splitting not a major part of 1H NMR spectra?

Correct AnswerverifiedMost of the carbons ...View AnswerShow Answer

Using a 60-MHz spectrometer, the protons in dichloromethane appear at 5.30 ppm. When the same sample is placed in a 100-MHz instrument, where does the signal appear?

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

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Deduce the identity of the following compound from the spectral data given. C7H10O2: 1H NMR, δ 1.16 (3H, singlet), 2.21 (2H, singlet); 13C NMR, δ 216.25 (singlet), 52.57 (singlet), 34.51 (triplet), 20.22 (quartet) (ppm)

Correct Answerverified2,2-dimeth...View AnswerShow Answer

Any process faster than ________ will be recorded as an average by NMR spectroscopy.

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1H nuclei located near electronegative atoms tend to be ________ relative to 1H nuclei which are not.

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

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

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Using the scale below, draw the 1H NMR spectrum for isobutyl acetate, shown below. Present the peaks with correct splitting patterns and at the approximate chemical shift (+/- 0.5 ppm). Just above each peak, indicate the relative integration value of each type of hydrogen.

Correct Answerverifiedδ 3.9 ppm (d, 2H), 2...View AnswerShow Answer

Deduce the identity of the following compound from the 13C NMR data given. C4H8O: δ 11.97 (triplet), 33.54 (triplet), 67.03 (doublet) (ppm)

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Deduce the identity of the following compound from the ¹H NMR data given. C₈H₁₈O: δ 0.89 (6H, doublet), 1.87 (1H, multiplet), 3.17 (2H, doublet)(ppm)

Correct Answer
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Deduce the identity of the following compound from the ¹H NMR data given. C₇H₇NO₃: δ 3.9 (3H, singlet), 6.9 (2H, doublet), 8.1 (2H, doublet) (ppm)

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p-nitroani...
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Predict the number of signals expected, their splitting, and their relative area in the ¹H NMR spectrum of 2-methylpropane (isobutane).

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2 signals:...
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Predict the number of signals expected in the proton spin decoupled ¹³C spectrum of cyclopentane.

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Deduce the identity of the following compound from the spectral data given. C₄H₈O₂: ¹H NMR, δ 1.23 (3H, triplet), 2.00 (3H, singlet), 4.02 (2H, quartet) (ppm); IR, 2980,

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Predict the number of signals expected in the proton spin decoupled ¹³C spectrum of m-dichlorobenzene (1,3-dichlorobenzene).

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Deduce the identity of the following compound from the ¹³C NMR data given. C₄H₁₀O: δ 10.0 (quartet), 22.9 (quartet), 32.0 (triplet), 69.6 (doublet) (ppm)

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Deduce the identity of the following compound from the spectral data given. C₃H₄BrN: ¹H NMR, δ 2.98 (2H, triplet), 3.53 (2H, triplet); ¹³C NMR, δ 21.05 (triplet), 23.87 (triplet), 118.08 (singlet) (ppm); IR, 2963,

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Deduce the identity of the following compound from the spectral data given. C₉H₁₀O₂: ¹³C NMR, δ 18.06 (quartet), 45.40 (doublet), 127.32 (doublet), 127.55 (doublet), 128.61 (doublet), 139.70 (singlet) (ppm), 180.98 (singlet); IR, broad 3500-2800,

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Why is carbon-hydrogen splitting not a major part of ¹H NMR spectra?

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

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Deduce the identity of the following compound from the spectral data given. C₇H₁₀O₂: ¹H NMR, δ 1.16 (3H, singlet), 2.21 (2H, singlet); ¹³C NMR, δ 216.25 (singlet), 52.57 (singlet), 34.51 (triplet), 20.22 (quartet) (ppm)

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2,2-dimeth...
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¹H nuclei located near electronegative atoms tend to be ________ relative to ¹H nuclei which are not.

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

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

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Using the scale below, draw the ¹H NMR spectrum for isobutyl acetate, shown below. Present the peaks with correct splitting patterns and at the approximate chemical shift (+/- 0.5 ppm). Just above each peak, indicate the relative integration value of each type of hydrogen.

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δ 3.9 ppm (d, 2H), 2...
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Deduce the identity of the following compound from the ¹³C NMR data given. C₄H₈O: δ 11.97 (triplet), 33.54 (triplet), 67.03 (doublet) (ppm)

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