Nuclear magnetic resonance (NMR) is a spectroscopic technique that uses a large magnet to study the spin properties of atomic nuclei. It's a physical phenomenon that occurs when nuclei in a strong magnetic field are perturbed by a weak oscillating magnetic field. The nuclei respond by producing an electromagnetic signal with a frequency characteristic of the magnetic field at the nucleus.  NMR can be used to study complex structures and interactions in environmental samples.  Some types of NMR include: Solution-state NMR: Provides high resolution data and comprehensive molecular... Show more

Nuclear magnetic resonance (NMR) is a spectroscopic technique that uses a large magnet to study the spin properties of atomic nuclei. It's a physical phenomenon that occurs when nuclei in a strong magnetic field are perturbed by a weak oscillating magnetic field. The nuclei respond by producing an electromagnetic signal with a frequency characteristic of the magnetic field at the nucleus. 

NMR can be used to study complex structures and interactions in environmental samples. 
Some types of NMR include:
Solution-state NMR: Provides high resolution data and comprehensive molecular information for soluble components
Solid-state NMR: Performed on dried samples packed into a rotor 

NMR was co-discovered in 1946 by Purcell, Pound, and Torrey of Harvard University and Bloch, Hansen, and Packard of Stanford University. 
Nuclear magnetic resonance imaging (NRMI) is a procedure that uses radio waves, a powerful magnet, and a computer to make a series of detailed pictures of areas inside the body. 

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Organic Chemistry Practice Test: Nuclear Magnetic Resonance

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20 Questions

1. Which of the compound show only one signal is present in the PMR spectra?

C8H18, C2H6OC3H4, C3H6C4H6, C5H12All of the mentioned

2. At room temperature, what is the number of singlet resonances observed in the ¹H NMR spectrum of Me₃CC(O)NMe₂ (N, N-Dimethylpivalamide)?

2354

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

Spin-spin couplingSpin constantCoupling constantChemical shift

4. At room temperature, what is the number of singlet resonances observed in the ¹H NMR spectrum of Me₃CC(O)NMe₂ (N, N-Dimethylpivalamide)?

3245

5. A proton Hb is coupled to four equivalent protons Ha. The multiplicity and the relative intensity of lines in the signal Hb is?

Doublet, I : 4Quintet, 1 : 4 : 6 : 4 : 1Quartet, 1 : 4 : 6 : 4Triplet, I : 4 : 6

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

C6H5CH2CH3– CH2 – CH(CH3) – N02CH3 – CH2 – CH3Br-CH = CH2

7. 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.

Diethyl ether and 2-Methoxypropanet-Butyl alcohol and 1-MethoxypropaneDiethyl ether and n-butanoldiethyl ether and t-Butyl alcohol

8. 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?

4-methylbenzyl alcohol4-methylanisole2-ethylphenol4-ethylphenol

9. Which of the following organic compound with molecular formula C₃H C₁₂ exhibits only one signal in the IH NMR spectrum?

1, 3-dichloropropane2, 2-dichloropropane1, 1-dichloropropane1, 2-dichloropropane

10. What are the number of signals in ¹H NMR in the given molecules?

2, 6, 4, 2 respectively2, 4, 6, 2 respectively2, 4, 2, 6 respectively3, 4, 4, 3 respectively

11. What will be the strength of coupling between geminal protons in the following molecules?

Decrease as the size of ring increaseRemains sameIncrease as the size of ring increaseNo relation between the size of the ring & coupling

12. In NMR spectroscopy, what is the product of Nuclear ‘g’ factor (g_N), the nuclear magneton and the magnetic field strength (B₀)?

spin-spin coupling constantmagnetogyric ratiochemical shiftenergy of transition from alpha to beta state

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

TripletSingletQuintetDoublet

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

QuintetDoubletTripletSinglet

15. How many peaks are expected in low-resolution NMR spectrum of vinyl chloride and ethyl cyclopropane?

5,33,56,33,6

16. Which of the compound show only one signal is present in the PMR spectra?

C3H4, C3H6C8H18, C2H6OC4H6, C5H12All of the mentioned

17. 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?

1:23:11:11:3

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

60 Hz, 100 Hz10Hz, 100Hz6 Hz, 10 Hz100 Hz, 60 Hz

19. What will be the strength of coupling between geminal protons in the following molecules?

No relation between the size of the ring & couplingRemains sameIncrease as the size of ring increaseDecrease as the size of ring increase

20. What is the value of gyramagnetic ratio of proton?

41.10 radian/Tesla26.75 radian/Tesla42.57 MHz/Tesla41.10 MHz/Tesla