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Organic Chemistry II > Chapter 13 Nuclear Magnetic Resonance Spectroscopy NMR > Flashcards

Chapter 13 Nuclear Magnetic Resonance Spectroscopy NMR Flashcards

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1
Q

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

a. number of signals
b. integral
c. splitting
d. chemical shift

A

a. number of signals

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2
Q

Which feature in the 1H NMR spectrum provides information about the relative number of each type of proton in a compound?

a. number of signals
b. integral
c. splitting
d. chemical shift

A

b. integral

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3
Q

Which feature in the 1H NMR spectrum provides information about the electronic environment of the protons in a compound?

a. number of signals
b. integral
c. splitting
d. chemical shift

A

d. chemical shift

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4
Q 
Which feature in the 1H NMR spectrum provides information about the number of neighboring protons
of each proton in the compound?
a. number of signals
b. integral
c. multiplicity
d. chemical shift
A

c. multiplicity

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5
Q

Which of the following is not true regarding 1H NMR spectroscopy?
a. “shielding” leads to peaks at lower values of  (sigma)
b. a “downfield” peak appears at a higher value of  (sigma)
c.  (sigma) 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  (sigma) 4 ppm.

A

c.  (sigma) for a particular proton depends on the magnetic field strength of the instrument used

Chemical Shift doesn’t change because of the instrument.

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6
Q

Which of the following is not true regarding 1H NMR spectroscopy?
a. a “downfield” peak appears at a lower value of 
b. on a 300 MHz instrument, a proton that adsorbs irradiation at a frequency 900 Hz higher
than the adsorption of TMS appears at  3 ppm.
c.  for a particular proton is independent of the magnetic field strength of the instrument
used.
d. “deshielding” leads to peaks at higher values of 

A

a. a “downfield” peak appears at a lower value of 

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7
Q

How many sets of equivalent protons are there in hexane?

a. 2
b. 3
c. 6
d. 7

A

b. 3

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8
Q

How many sets of equivalent protons are there in 2-methylhexane?

a. 2
b. 3
c. 6
d. 7

A

c. 6

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9
Q

How many sets of equivalent protons are there in 3-methylhexane?

a. 2
b. 3
c. 6
d. 7

A

d. 7

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10
Q

What is the splitting of the signal in the 1H NMR spectrum for the methyl protons of ethane?

a. singlet
b. doublet
c. triplet
d. quartet

A

a. singlet

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11
Q

What is the splitting of the signal in the 1H NMR spectrum for the methyl protons of propane?

a. singlet
b. doublet
c. triplet
d. quartet

A

c. triplet

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12
Q

What is the splitting of the signal in the 1H NMR spectrum for the methyl protons of 1-bomo-2- methylpropane?

a. singlet
b. doublet
c. triplet
d. nonet

A

b. doublet

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13
Q

Which of the following combinations of peaks appears in the 1H NMR spectrum of diethyl ether, CH3CH2OCH2CH3?

a. a triplet and a doublet
b. a quartet and a sextet
c. two singlets
d. a triplet and a quartet

A

d. a triplet and a quartet

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14
Q

Which of the following combinations of peaks appears in the 1H NMR spectrum of butane?

a. a triplet and a doublet
b. a triplet and a quartet
c. a triplet and a sextet
d. two singlets

A

b. a triplet and a quartet

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15
Q

Which of the following combinations of peaks appears in the 1H NMR spectrum of 2,3- dimethylbutane?

a. two doublets
b. a doublet and a septet
c. a singlet and two doublets
d. a doublet and an octet

A

a. two doublets

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16
Q

Which of the following combinations of peaks appears in the 1H NMR spectrum of 1,2- dimethyoxyethane, CH3OCH2CH2OCH3?

a. two singlets
b. a singlet and a triplet
c. a singlet and two triplets
d. a doublet and a triplet

A

a. two singlets

17
Q

Which of the following combinations of peaks appears in the 1H NMR spectrum of 1,4- dimethyoxyethane, CH3OCH2CH2CH2CH2OCH3?

a. three singlets
b. a singlet, a triplet, and a quintet
c. a singlet and two triplets
d. a doublet and a triplet

A

c. a singlet and two triplets

18
Q

Which of the following combinations of peaks appears in the 1H NMR spectrum of 2-methylpropane?

a. two singlets
b. a singlet and a nonet
c. a singlet and a decet
d. a doublet and a decet

A

d. a doublet and a decet

19
Q

What is the appearance of the signal corresponding to the CH2 protons in the 1H NMR spectrum of ethyl methyl ether, CH3CH2OCH3?

a. a doublet
b. a triplet
c. a quartet
d. a septet

A

c. a quartet

20
Q

What is the relative area of the six peaks in a sexet in an 1H NMR spectrum?

a. 1:2:3:3:2:1
b. 1:3:6:6:3:1
c. 1:5:10:10:5:1
d. 1:6:15:15:6:1

A

c. 1:5:10:10:5:1

21
Q

What is the relative area of the six peaks in a septet in an 1H NMR spectrum?

a. 1:2:3:4:3:2:1
b. 1:3:6:12:6:3:1
c. 1:6:15:30:15:6:1
d. 1:6:15:20:15:6:1

A

d. 1:6:15:20:15:6:1

22
Q

How many signals appear in proton-decoupled 13C NMR spectrum of 3,4-dimethylhexane? a. 3

b. 4
c. 5
d. 6

A

b. 4

23
Q

How many signals appear in proton-decoupled 13C NMR spectrum of 2,5-dimethylhexane? a. 3

b. 4
c. 5
d. 6

A

a. 3

24
Q

How many signals appear in the proton-decoupled 13C NMR spectrum of 1,4-dibromobenzene? a. 1

b. 2
c. 3
d. 4

A

b. 2

25
Q

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

b. 2
c. 3
d. 4

A

d. 4

26
Q

How many signals appear in the proton-decoupled 13C NMR spectrum of 1,2-dibromobenzene? a. 1

b. 2
c. 3
d. 4

A

c. 3

27
Q

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

a. 3
b. 4
c. 5
d. 7

A

d. 7

28
Q

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

a. 3
b. 4
c. 5
d. 7

A

d. 7

29
Q

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

a. 3
b. 4
c. 5
d. 7

A

d. 7

Organic Chemistry II (2 decks)

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