Organic Chemistry Multiple Choice Questions and Answers – Nuclear Magnetic Resonance

Questions
1 In NMR spectroscopy, what is the product of Nuclear ‘g’ factor (gN), the nuclear magneton and the magnetic field strength (B0)?
A energy of transition from alpha to beta state
B chemical shift
C spin-spin coupling constant
D magnetogyric ratio

Answer: energy of transition from alpha to beta state
2 An organic compound having the molecular formulae C10H14 exhibited two singlets in the 1H NMR spectrum and three signals in the 13C NMR. What is the compound?

Organic Chemistry MCQ

A (a)
B (b)
C (c)
D (d)

Answer: (a)
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3 The 1H NMR spectrum of a dilute solution of a mixture of acetone and dichloromethane in CDCl3 exhibits two singlets of 1:1 intensity. What will be the molar ratio of acetone to dichloromethane in the solution?
A 3:1
B 1:3
C 1:1
D 1:2

Answer: 1:3
4 What will be the strength of coupling between geminal protons in the following molecules?

Organic Chemistry MCQ

A Decrease as the size of ring increase
B Increase as the size of ring increase
C Remains same
D No relation between the size of the ring & coupling

Answer: Increase as the size of ring increase
5 What is the value of gyramagnetic ratio of proton?
A 41.10 radian/Tesla
B 42.57 MHz/Tesla
C 26.75 radian/Tesla
D 41.10 MHz/Tesla

Answer: 42.57 MHz/Tesla
6 What are the number of signals in 1H NMR in the given molecules?

Organic Chemistry MCQ

A 3, 4, 4, 3 respectively
B 2, 6, 4, 2 respectively
C 2, 4, 6, 2 respectively
D 2, 4, 2, 6 respectively

Answer: 2, 6, 4, 2 respectively
7 How many peaks are expected in low-resolution NMR spectrum of vinyl chloride and ethyl cyclopropane?
A 3,5
B 5,3
C 6,3
D 3,6

Answer: 3,5
8 What will be the NMR frequency in MHz of bare 1H in a magnetic field of intensity 1.4092 tesla (given gN = 5.585 and μN = 5.05 x 10-27 JT-1)?
A 60 MHz
B 120 MHz
C 100 MHz
D 15 MHz

Answer: 60 MHz
9 At room temperature, what is the number of singlet resonances observed in the 1H NMR spectrum of Me3CC(O)NMe2 (N, N-Dimethylpivalamide)?
A 3
B 4
C 5
D 2

Answer: 3
10 An organic compound (MF; C8H10O) exhibited the following 1H NMR special data: 62.5 (3H, s), 3.8 (314, s), 6.8 (2H, d, J 8 Hz), 7.2 (2H, d, J 8 Hz) ppm. What will be the compound among the choices?
A 4-ethylphenol
B 2-ethylphenol
C 4-methylanisole
D 4-methylbenzyl alcohol

Answer: 4-methylanisole

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