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. 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?

1:31:21:13:1

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

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

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

42.57 MHz/Tesla41.10 radian/Tesla26.75 radian/Tesla41.10 MHz/Tesla

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

Br-CH = CH2C6H5CH2CH3– CH2 – CH(CH3) – N02CH3 – CH2 – CH3

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

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

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

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

7. 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?

8. 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.

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

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

chemical shiftspin-spin coupling constantenergy of transition from alpha to beta statemagnetogyric ratio

10. 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 : 4Doublet, I : 4Triplet, I : 4 : 6Quintet, 1 : 4 : 6 : 4 : 1

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

6,35,33,53,6

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

5243

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

No relation between the size of the ring & couplingDecrease as the size of ring increaseIncrease as the size of ring increaseRemains same

14. 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?

CH3OCH2CONHCH3CH3CH2NHCOOCH3CH3CH2OCH2CONH2CH3NHCOOCH2CH3

15. 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)?

60 MHz100 MHz120 MHz15 MHz

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

Coupling constantSpin constantSpin-spin couplingChemical shift

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

SingletDoubletQuintetTriplet

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

All of the mentionedC4H6, C5H12C3H4, C3H6C8H18, C2H6O

19. 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?

2-ethylphenol4-methylanisole4-methylbenzyl alcohol4-ethylphenol

20. 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, 100Hz100 Hz, 60 Hz6 Hz, 10 Hz