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NMR

Total questions: 100

Worksheet time: 1hrs 27mins

Name
Class
Date
1.

full form of NMR spectroscopy s

a)

Nuclear Magnetic Resonance

b)

Nil Magnetic Resonance

c)

Nuclear Magnet Resonance

d)

Nuclear Magnetic Re

2.

Which of the compound is taken as standard for recording chemical shift?

a)

Dimethylsilane

b)

Trimethylsilane

c)

Tetramethylsilane

d)

Methylsilane

3.

How many NMR signals in propane is

a)

4

b)

3

c)

2

d)

1

4.
Splitting occurs only in 
a)
low resolution H NMR
b)
high resolution H NMR
c)
low resolution C NMR
d)
high resolution C NMR
5.
NMR can only be done with 
a)
molecules
b)
1H and 13C
c)
any element with a odd number of protons
d)
any element with a odd number of nucleons
6.

Which type of electromagnetic waves are used in NMR experiments?

a)

Infrared waves

b)

Microwaves

c)

Radio waves

d)

Ultraviolet waves

7.
Which molecule will produce the following spectra with 2 different H environment ?
a)
CH3CH2COCH2CH3
b)
CH3CH2COOCH2CH3
c)
CH3CH2CH2CH3
d)
CH3CH2CH2CH2CH3
8.

which of the following information is not given on an 1H NMR spectra?

a)

number of protons within that environment

b)

number of different environments a proton can be found in

c)

what might be on neighbouring atoms

d)

how much energy a bond absorbs

9.
Which molecule will produce the following spectra with 3 different H environment?
a)
CH3CH2OH
b)
CH3CH2COOH
c)
CH3CH2CHO
d)
CH3COOCH2OH
10.
Which molecule will produce the following spectra with 3 different H environment?
a)
CH3CH2OH
b)
CH3CH2COOH
c)
CH3CH2CHO
d)
CH3COOCH2OH
11.
Which molecule will produce the following spectra with 2 different H environment ?
a)
(CH3)2CH2COH
b)
(CH3)3COOH
c)
(CH3)3CHO
d)
CH3CH2CH2CH2CH3
12.
Which molecule will produce the following spectra with one H environment?
a)
CH3CH2CH3
b)
CH3COOCH3
c)
CH3CH3
d)
CH3COCH3
13.
How many different H environment for molecule shown?
a)
4 Hydrogen environment, in (1.1.3.3) ratio
b)
4 Hydrogen environment, in (1.1.3.6) ratio
c)
3 Hydrogen environment, in (1.1.6) ratio
d)
3 Hydrogen environment, in (1.1.3) ratio
14.
How many different H environment for molecule shown?
a)
3 Hydrogen environment, in (2.2.3) ratio
b)
4 Hydrogen environment, in (3.2.2.3) ratio
c)
3 Hydrogen environment, in (3.2.3) ratio
d)
4 Hydrogen environment, in (3.3.2.3) ratio
15.
How many different H environment for molecule shown?
a)
4 Hydrogen environment, in (3.3.1.3) ratio
b)
4 Hydrogen environment, in (3.1.6.3) ratio
c)
3 Hydrogen environment, in (6.1.3) ratio
d)
3 Hydrogen environment, in (3.6.3) ratio
16.
How many different H enviroment for molecule shown?
a)
2 Hydrogen environment, in (2.2) ratio
b)
4 Hydrogen environment, in (1.1.1.1) ratio
c)
1 Hydrogen environment, in (4) ratio
d)
2 Hydrogen environment, in (1.1.1.1) ratio
17.
The number of peaks in 13C NMR  for CH3 CH2 CH3 is
a)
0
b)
1
c)
2
d)
3
18.

Which of the following would be different for 1-butanol and

2-butanol

a)

The number of peaks on low resolution H NMR

b)

the molar mas

c)

the number of peaks in C NMR

d)

the finger print region of the infrared spectrum

19.

The splitting pattern for the Hydrogen on the carbon at the end in high resolution 1H NMR for CH3 CH2 CH3

a)

quartet

b)

multiplet

c)

triplet

20.

How many carbon environments?

a)

1

b)

2

c)

4

d)

6

21.

How many carbon environments?

a)

1

b)

2

c)

3

d)

4

22.

How many carbon environments?

a)

1

b)

2

c)

3

d)

6

23.
In chemistry, how many types of subatomic particles are considered to form everything?
a)
two
b)
three
c)
92
d)
billions
24.
What is defined as "a well-tested set of ideas that explains many disparate observations"?
a)
a theory
b)
a guess
c)
a law
d)
a hypothesis
25.
Which scientist mathematically proved the existence of atoms and molecules in 1905?
a)
Robert Brown
b)
Albert Einstein
c)
Antoine Lavoisier
d)
Ernest Rutherford
26.

What colour is Lisbet?

a)

White with black dots

b)

Gold

c)

Black

d)

Red

27.

The following 13CNMR spectrum (CDCl3, 300 MHz) corresponds to...

a)

Isopropanol

b)

1-Propanol

c)

Ethanol

d)

Tert-butanol

28.

13CNMR experiments usually require less amount of sample than 1HNMR experiments do

a)

True

b)

False

29.

In a broad-band decoupling 13CNMR experiment, the peak intensity is usually increased by NOE effects allowing to improve the signal/noise ratio

a)

True

b)

False

30.

Which of the following has three types of hydrogens in the following compounds?

a)

Br-CH = CH2

b)

CH3 – CH2 – CH3

c)

C6H5CH2

d)

CH3– CH2 – CH(CH3) – N02

31.

In a 13CNMR experiment, 13C-13C couplings are negligible due to..

a)

The very low 13C-13C coupling constants

b)

The very low 13C natural abundance

c)

The very low 12C natural abundance

32.

How many Hertz does 1 ppm correspond to for an PMR spectrometer operating at a radio frequency of 60 MHz and 100 MHz?

a)

6 Hz, 10 Hz

b)

60 Hz, 100 Hz

c)

100 Hz, 60 Hz

d)

10Hz, 100Hz

33.

The distance between the centers of the peaks of doublet is called as?

a)

Coupling constant

b)

Spin constant

c)

Spin-spin coupling

d)

Chemical shift

34.

H2, CH4, C2H6 and C6H6 exhibit which PMR spectra?

a)

Singlet

b)

Doublet

c)

Triplet

d)

Quintet

35.

Which of the following would not give singlet signal in NMR?

a)

Ethane

b)

Dimethylether

c)

Diethylether

d)

Acetone

36.

The phenomenon in which resonance of proton A is said to have been split by proton B is known as

a)

Spin-spin splitting

b)

Coupling constant

c)

Chemical shift

d)

Spin Constant

37.

How many NMR signals would be given by the compound (CH3)2CHCH2CH3

a)

1

b)

2

c)

3

d)

4

38.
Which molecule will produce the following spectra with 3 different H environment?
a)
CH3CH2OH
b)
CH3CH2COOH
c)
CH3CH2CHO
d)
CH3COOCH2OH
39.
NMR can only be done with 
a)
molecules
b)
1H and 13C
c)
any element with a odd number of protons
d)
any element with a odd number of nucleons
40.
The splitting pattern for the Hydrogen on the carbon at the end in high resolution 1H NMR  for CH3 CH2 CH3  
a)
a sextet
b)
a heptet
c)
a triplet
d)
isa quartet
41.

which of the following information is not given on an 1H NMR spectra?

a)

number of protons within that environment

b)

number of different environments a proton can be found in

c)

what might be on neighbouring atoms

d)

how much energy a bond absorbs

42.

Choose the CORRECT definition of quantitative analysis

a)

Measurement of the quantities of particular constituents present in a substance

b)

Measuring the physical appearance of substance

c)

Measuring the weight of a particular constituents present in a substance

43.

The following are examples of instrumental methods, EXCEPT

a)

Conductivity

b)

Chromatography

c)

Spectroscopy

d)

Gravymetry

44.
Which of the following type of electromagnetic radiation affects the bonds,vibrating ,stretching rocking...
a)
infrared
b)
ultraviolet
c)
microwaves
d)
radiowaves
45.
The finger print region is 
a)
different for each organic compound
b)
 from 600 - 1400 cm-1
c)
both the above
46.

Nuclear Magnetic Resonance (NMR) is a

a)

electroanalytical technique

b)

chromatography technique

c)

spectroscopy technique

d)

radioanalytical technique

47.

The fundamental requirements for high-resolution NMR spectroscopy are

a)

a static magnetic field and a probe

b)

a probe and a console

c)

a dynamic magnetic field, a probe and a console

d)

a static magnetic field, a probe and a console

48.

The lower the electron density around a nucleus,

a)

the lower it spin frequency

b)

the higher it spin frequency

c)

both correct

d)

any correct

49.

Signal multiplicity observed in NMR spectra is influenced by

a)

the electron density distribution in the molecule

b)

the interaction through the space between nuclei

c)

the interaction through the bond between nuclei

d)

the local magnetic field

50.

The following 13CNMR spectrum (CDCl3, 300 MHz) corresponds to...

a)

Isopropanol

b)

1-Propanol

c)

Ethanol

d)

Tert-butanol

51.
The splitting pattern for the Hydrogen on the middle carbon in high resolution 1H NMR  for CH3 CH2 CH3 is
a)
a sextet
b)
a heptet
c)
a triplet
d)
a quartet
52.
Which of the following would be different  for 1-butanol and
 2-butanol
a)
The number of peaks on low res H NMR
b)
the molar mas
c)
the number of peaks in C NMR
d)
the finger print region of the infrared spectrum
53.
NMR is used to determine
a)
the function groups present in inorganic molecules
b)
the molar mass of the compound
c)
the structure of the molecule
d)
the number of different carbon or hydrogen enviroments in the molecule
54.
The splitting pattern for the hydrogen bonded to the oxygen in CH3CH(OH)CH3 
a)
0
b)
1
c)
2
d)
3
55.
An Infrared spectroscopy of an organic molecule indicates the presence of a C=C and at least one C-C bond The molecule also contains at least one amino group,but no carbonyl(C=O) groups the molecule could be
a)
propanamide
b)
1-aminoprop-1-ene
c)
2-methyl-2-aminopropane
d)
3-aminobutane
56.

How many carbon environments?

a)

1

b)

2

c)

3

d)

4

57.

How many carbon environments?

a)

2

b)

3

c)

4

d)

5

58.

How many carbon environments?

a)

4

b)

5

c)

6

d)

7

59.
Which molecule will produce the following spectra with 2 different H environment?
a)
CH3COOH
b)
CH3CHO
c)
CH3CH2OH
d)
CH3COOCH3
60.
How many different H enviroment for molecule shown?
a)
4 Hydrogen environment, in (3.3.3.2) ratio
b)
5 Hydrogen environment, in (3.3.3.1.1) ratio
c)
3 Hydrogen environment, in (9.1.1) ratio
d)
2 Hydrogen environment, in (9.2) ratio
61.

NMR is the interaction between...

a)

The nucleus of an atom and its spin energy level

b)

proton and carbon

c)

Electromagnetic radiation and the nucleus of an atom

d)

Radiofrequency energy and an atom

62.

When a nucleus has an odd number of protons and/or neutrons, which can be probed by NMR spec, it is called?

a)

Nuclear spin

b)

Spin state

c)

Atom spin

d)

Electron spin

63.

The total number of neutrons and protons is always an ___ number

a)

Even

b)

Odd

c)

Even and Odd

64.

Protons and neutrons in a nucleus behave as if they are

a)

Nothing

b)

Rotating

c)

Interacting

d)

Spinning

65.

The spinning charge in the nucleus creates a

a)

Energy difference

b)

Magnetic moments

c)

Dipole moments

d)

Energy release

66.

What magnetic moment (spin quantum number) do the nuclei 1H and 13C have?

a)

I= 1/2

b)

I= 0

c)

I= 1

d)

I= 3/2

67.

How many orientations are there for I = 1/2?

a)

0

b)

1

c)

2

d)

All as above

68.

How can magnetic moment orientations be differentiated?

a)

Different orientations have different energies in the presence of an external magnetic field.

b)

Different orientations have different energies in the presence of an internal magnetic field.

69.

when RESONANCE occur, both nuclear spin states will be occupied but the lower energy spin states (+1/2) will be slightly more occupied.

a)

True

b)

False

70.

which elements have magnetic resonance properties?

a)

2H,13C

b)

1H,12C

c)

2H, 12C

d)

1H, 13C

71.

Magnetic field applied on a spinning nucleus (proton) makes them align WITH or AGAINST it. A photon (particle) with the right energy can be absorbed and cause the proton (spinning nucleus) to transition to a higher energy state. What is the name of this excitation?

a)

Alpha and Beta states

b)

Spin =1

c)

Transition radiationless

d)

Relaxation

e)

Resonance photon

72.

The name of the particles that tend to align with an applied external magnetic field

a)

Excited state

b)

Ground or Alpha state

c)

Boltzman Equilibrtium

d)

Beta state

73.

(Displacement of the NMR signal, in Hz, from the reference)/(Spectrometer frequency in MHz)

a)

ppm

b)

tau scale

c)

scalar coupling

d)

proton NMR spectrum

74.

Aregion around a magnetic material or a moving electric charge within which the force of magnetism acts

a)

magnetic field

b)

Shielding

c)

downfield shift

d)

NMR spectrum

75.

the specific frequency at which magnetic resonance in a nucleus can be excited and detected, and varies directly with magnetic field strength

a)

Larmor equation

b)

Gyromagnetic ratio

c)

Larmor frequency

d)

off-resonance excitation frequency

76.

Which of the following has three types of hydrogens in the following compounds?

a)

Br-CH2-CH = CH2

b)

CH3 – CH2 – CH3

c)

C6H5CH2

d)

CH3– CH2 – CH(CH3) – N02

77.

which of the following could be NOT used as a solvent for 1H NMR?

a)

CDCl3

b)

D2O

c)

CHCl3

d)

CCl4

78.

Magic angle in solid state NMR spectroscopy

a)

54.74

b)

90

c)

0

d)

74.54

79.

A molecule absorbs IR at a wavenumber of 1720 cm-1. Which functional group could account for this absorption.

I. aldehydes

II. esters

III. alcohol

a)

I only

b)

I and II

c)

I, II and III

d)

none of the above

80.
A molecule has a broadband at 3200cm-1 and sharp band at 1711cm-1. the molecule is most likely an
a)
amide
b)
ester
c)
alkanol
d)
carboxylic acid
81.

The property of nuclei that allows them to have magnetism

a)

spin

b)

resonance

c)

charge

d)

mass

82.

When an external magnetic field is applied the nuclei will align up imperfectly causing

a)

precession

b)

ascension

c)

precipitation

d)

radio frequency emission

83.

The frequency of precession called the __________ frequency, which depends upon the nature of the nucleus and the strength of the magnetic field.

a)

Lamour

b)

Lemon

c)

Le Tour

d)

Lemur

84.

When a short pulse of RF waves are applied at the

a)

same frequency of precession of the H nuclei, they will resonate

b)

same frequency of the H nuclei, they will resonate

c)

same frequency of precession of the magnetic field, they will resonate

d)

same frequency of the non-uniform magnetic field, they will resonate

85.

When the RF pulse ends the nuclei will return to their equilibrium state after a short time, called the

a)

relaxation time

b)

reparation time

c)

retrieval time

d)

revolution time

86.

Hydrogen is used for nuclear magnetic resonance imaging

a)

due to its abundance in living tissue

b)

due to its relative atomic mass number being low

87.

A patient undergoing a scan is placed inside a

a)

a very large uniform magnetic field (about 1 T)

b)

a very large magnetic field (about 1 T)

c)

a very large non-uniform magnetic field (about 1 T)

d)

a uniform magnetic field (about 1 T)

88.

In order to locate a particular position of hydrogen atoms within a patient

a)

a non-uniform magnetic field is also applied

b)

a uniform magnetic field is also applied

c)

a non-uniform electric field is also applied

d)

the RF pulse is turned on and off

89.

The RF pulse is transmitted to the patient by means of

a)

electromagnetic coils

b)

circuits

c)

permanent magnets

d)

capacitors

90.

A student wrote attempted an explanation for the NMRI and included the following points:

  • a large uniform magnetic field is applied
  • H nuclei precess about the applied field direction
  • radio frequency pulse causes resonance of nuclei and they absorb energy
  • upon relaxation the nuclei emit energy as an RF pulse which is detected by the coils and processed by computer
  • use of a non-magnetic field allows for position of nuclei to be found and for location of detection to be changed
  • 2-D slices of the body can be detected in turn by repeating the above and added into a 3-D image by computer
a)

the answer is perfect

b)

one more detail needed : Lamour frequency

c)

one more detail needed : a large magnetic field

d)

one more detail needed : hydrogen nuclei are used

91.

Which of the following deuterated solvents is able to show anisotropic shift over the protons of a given molecule?

a)

CDCl3

b)

C6D6

c)

D2O

d)

Deuterated methylene chloride

92.

The chemical shift of an active NMR nucleus depends on the following properties:

a)

Only inductive effects

b)

Only mesomeric effects

c)

Only anisotropic effects

d)

All the mentioned effects

93.

The chemical shift of an active NMR nucleous is higher...

a)

When using a 300 MHz instrument

b)

When using a 500 MHz instrument

c)

When using a 100 MHz instrument

d)

Chemical shift does not depend on the magnetic field of the instrument

94.

In a 1HNMR spectrum, a peak with a chemical shift of 10 ppm is said to be...

a)

Deshielded

b)

All the two proposed answers

c)

At Downfield

d)

Non of the two proposed answers

95.

In a 1HNMR spectrum, a peak at low frequency is said to be...

a)

Deshielded

b)

All the two proposed answers

c)

Shielded

d)

Non of the two proposed answers

96.

The chemical shift (300 MHz, CDCl3) of the 1Hs of MeCl is lower (3.05 ppm) than for methylene chloride (5.30 ppm) due to anisotropic effects

a)

False

b)

True

97.

Ortho 1Hs of anisole (300 MHz, CDCl3) are more shielded (6.30 ppm) than meta ones (7.26 ppm) mainly due to...

a)

Anisotropic effects

b)

Resonance effects

c)

The use of CDCl3 as solvent

d)

Inductive effects

98.

How many different triplets does ethyl acetate show in its 1HNMR spectrum (300 MHz, CDCl3)?

a)

2

b)

1

c)

0

d)

4

99.

How many different triplets does 1,2-ethanediol show in its 1HNMR spectrum (300 MHz, CDCl3)?

a)

2

b)

1

c)

0

d)

3

100.

The reduction of 2-pentyne yields a compound which shows, among others, two NMR absorptions around 6 ppm in the 1HNMR spectrum (300 MHz, CDCl3). Which reagent has been used to reduce 2-pentyne?

a)

H2O2

b)

Lindlar's catalyst

c)

H2, Pd/C

d)

NaBH4

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