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

chemical shiftenergy of transition from alpha to beta statespin-spin coupling constantmagnetogyric ratio

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

CH3– CH2 – CH(CH3) – N02Br-CH = CH2C6H5CH2CH3 – CH2 – CH3

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

TripletSingletDoubletQuintet

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

Spin constantCoupling constantChemical shiftSpin-spin coupling

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

4325

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

C3H4, C3H6C4H6, C5H12All of the mentionedC8H18, C2H6O

7. Which of the following 1_H-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?

CH3CH2NHCOOCH3CH3CH2OCH2CONH2CH3OCH2CONHCH3CH3NHCOOCH2CH3

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

6 Hz, 10 Hz10Hz, 100Hz60 Hz, 100 Hz100 Hz, 60 Hz

9. 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?

10. 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?

1:31:23:11:1

11. What will be the NMR frequency in MHz of bare ¹H in a magnetic field of intensity 1.4092 tesla (given g_N = 5.585 and μ_N = 5.05 x 10^-27 JT^-1)?

15 MHz120 MHz60 MHz100 MHz

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

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

13. The 1_H NMR spectrum of CH₃OCHCICH₂Cl will exhibit ________

A three proton singlet. One proton singlet and a two proton doubletA three proton doublet. One proton singlet and a two proton doubletA three proton triplet. One proton triplet and a two proton tripletA three proton singlet. One proton triplet and a two proton doublet

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

2435

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

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

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

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

17. The 1_H NMR spectrum of CH₃OCHCICH₂Cl will exhibit ________

A three proton doublet. One proton singlet and a two proton doubletA three proton singlet. One proton singlet and a two proton doubletA three proton singlet. One proton triplet and a two proton doubletA three proton triplet. One proton triplet and a two proton triplet

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

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

3,55,33,66,3

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

Coupling constantSpin constantSpin-spin couplingChemical shift