Nuclear Magnetic Resonance

Question 1

The nuclei with a spin quantum number greater than _______ can exhibit the
NMR phenomenon.
a) 0
b) 5
c) 10
d) -5

Answer 1

a) 0

Question 2

The number of different orientations which a magnetic nucleus can take is ____________
a) 2I
b) 2I-1
c) 2I+1
d) 4I

Answer 2

c) 2I+1

Question 3

Number of NMR signals obtained in CH3COCH3 will be ____________
a) 6
b) 3
c) 2
d) 1

Answer 3

d) 1

Question 4

Propene as well as 2-Butene(cis) will show equal number of signals in their NMR spectra.
a) True
b) False

Answer 4

b) False

Question 5

Select the incorrect statement from the following option.
a) TMS stands for tetra methyl silane
b) All the hydrogen in TMS have the same chemical shift
c) TMS has a high boiling point, so it is not easily lost when holding the NMR sample
d) TMS is relatively unreactive with most functional groups

Answer 5

c) TMS has a high boiling point, so it is not easily lost when holding the NMR sample

Question 6

The NMR spectra of the functional isomers of the molecular formula C2H6O show _________ and _________ signals respectively.
a) 1, 2
b) 1, 3
c) 1, 4
d) 1, 5

Answer 6

b) 1, 3

Question 7

The number of signals in 1-propanol are _________ while those in 2-propanol are ______
a) 4, 3
b) 4, 2
c) 2, 4
d) 3, 4

Answer 7

a) 4, 3

Question 8

For NMR spectrum, carbon tetrachloride and water can be successfully used as a solvent.
a) True
b) False

Answer 8

a) True

Question 9

In how many ways –CH3 protons can couple with the protons on adjacent carbon atom relative to the external field.
a) 1
b) 2
c) 3
d) 4

Answer 9

d) 4

Question 10

Which of the following is inversely proportional to the chemical shifts positions (δ)?
a) Frequency of unknown group of protons
b) Frequency of TMS
c) Operating frequency of the instrument
d) All of the mentioned

Answer 10

c) Operating frequency of the instrument