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Free download in PDF NMR Spectroscopy Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
NMR spectroscopy indicates the chemical nature of the __________ and spatial positions of
_______
[A]
Electrons, Protons
[B]
Neutrons, electrons
[C]
Nuclei, electrons
[D]
Nuclei, neighbouring nuclei
Answer: Nuclei, neighbouring nuclei
(22)
When energy is absorbed by the sample, the absorption can be observed as a change in signal developed by which of the following components?
[A]
Amplifier
[B]
Photodetector
[C]
GM counter
[D]
Radiofrequency detector
Answer: Radiofrequency detector
(23)
Which of the following are considered to be the lowest form of Electromagnetic radiation?
[A]
IR radiation
[B]
Micro waves
[C]
UV radiation
[D]
Radio waves
(24)
Nuclei having either the number of protons or neutrons as odd have _______ spin.
[A]
Integral spin
[B]
Half integral spin
[C]
Zero spin
[D]
Positive spin
Answer: Half integral spin
(25)
The difference between the field necessary for resonance in the sample and in some arbitrary chosen compound is which of the following?
[A]
Field shift
[B]
Matrix effects
[C]
Chemical shift
[D]
Resonance shift
(26)
Which of the following organic compound with molecular formula C3H C12 exhibits only one signal in the IH NMR spectrum?
[A]
2, 2-dichloropropane
[B]
1, 2-dichloropropane
[C]
1, 3-dichloropropane
[D]
1, 1-dichloropropane
Answer: 2, 2-dichloropropane
(27)
The 1H NMR spectrum of CH3OCHCICH2Cl will exhibit ________
[A]
A three proton doublet. One proton singlet and a two proton doublet
[B]
A three proton singlet. One proton singlet and a two proton doublet
[C]
A three proton singlet. One proton triplet and a two proton doublet
[D]
A three proton triplet. One proton triplet and a two proton triplet
Answer: A three proton singlet. One proton triplet and a two proton doublet
(28)
Which of the following 1H-NMR spectrum of compound with molecular formula C4H9NO2 shows delta 5.30 (broad, IH), 4.10(q, 2H), 2.80 (d, 3H), 1.20 (t, 3H) ppm?
[A]
CH3NHCOOCH2CH3
[B]
CH3CH2NHCOOCH3
[C]
CH3OCH2CONHCH3
[D]
CH3CH2OCH2CONH2
(29)
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
(30)
Which of the compound show only one signal is present in the PMR spectra ?
[A]
C3H4, C3H6
[B]
C4H6, C5H12
[C]
C8H18, C2H6O
[D]
All of the mentioned
Answer: All of the mentioned
31
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
32
Compound C4H10O gave PMR spectrum consisting of two groups of lines (multiplets) with relative intensities in the ratio 3 : 2. Other compound of the same formula exhibited two lines with relative area of 9 : 1. What are these compounds.
[A]
Diethyl ether and n-butanol
[B]
t-Butyl alcohol and 1-Methoxypropane
[C]
diethyl ether and t-Butyl alcohol
[D]
Diethyl ether and 2-Methoxypropane
Answer: diethyl ether and t-Butyl alcohol
33
A proton Hb is coupled to four equivalent protons Ha. The multiplicity and the relative intensity of lines in the signal Hb is
[A]
Doublet, I : 4
[B]
Triplet, I : 4 : 6
[C]
Quintet, 1 : 4 : 6 : 4 : 1
[D]
Quartet, 1 : 4 : 6 : 4
Answer: Quintet, 1 : 4 : 6 : 4 : 1
34
NMR spectroscopy indicates the chemical nature of the __________ and spatial positions of
_______
[A]
Electrons, Protons
[B]
Neutrons, electrons
[C]
Nuclei, electrons
[D]
Nuclei, neighbouring nuclei
Answer: Nuclei, neighbouring nuclei
35
Interaction between matter and electromagnetic radiation can be observed by subjecting a substance to magnetic fields in which of the following manner?
[A]
Both fields should be stationary
[B]
Both fields should be varying
[C]
One field should be stationary and the other should be varying
[D]
It must be subjected to only one field
Answer: One field should be stationary and the other should be varying
36
When energy is absorbed by the sample, the absorption can be observed as a change in signal developed by which of the following components?
[A]
Amplifier
[B]
Photodetector
[C]
GM counter
[D]
Radiofrequency detector
Answer: Radiofrequency detector
37
Which of the following are considered to be the lowest form of Electromagnetic radiation?
[A]
IR radiation
[B]
Micro waves
[C]
UV radiation
[D]
Radio waves
38
The amount of energy available in radio frequency radiation is sufficient for which of the following?
[A]
Excite an atom
[B]
Vibrate an atom
[C]
Vibrate a molecule
[D]
Affect the nuclear spin of an atom
Answer: Affect the nuclear spin of an atom
39
When placed in a magnetic field, all the random spins of the nuclei
[A]
stop
[B]
reverse direction
[C]
align with the magnetic field
[D]
rotate to 90° away from the induced field
Answer: align with the magnetic field
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