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. 

Show less

Organic Chemistry Practice Test: Nuclear Magnetic Resonance

Time left 00:00

20 Questions

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

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

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

C6H5CH2CH3 – CH2 – CH3CH3– CH2 – CH(CH3) – N02Br-CH = CH2

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

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

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

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

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

CH3 – CH2 – CH3CH3– CH2 – CH(CH3) – N02Br-CH = CH2C6H5CH2

6. 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?

1:23:11:31:1

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. 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 MHz15 MHz120 MHz100 MHz

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

Spin constantSpin-spin couplingCoupling constantChemical shift

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

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

11. 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 triplet and a two proton doubletA three proton singlet. One proton singlet and a two proton doubletA three proton triplet. One proton triplet and a two proton triplet

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 constantchemical shiftenergy of transition from alpha to beta statemagnetogyric ratio

13. 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 : 4Triplet, I : 4 : 6Quintet, 1 : 4 : 6 : 4 : 1Quartet, 1 : 4 : 6 : 4

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

5,33,53,66,3

15. 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?

CH3OCH2CONHCH3CH3CH2OCH2CONH2CH3NHCOOCH2CH3CH3CH2NHCOOCH3

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

2435

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

C4H6, C5H12All of the mentionedC8H18, C2H6OC3H4, C3H6

18. 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 MHz60 MHz120 MHz100 MHz

19. 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?

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

Increase as the size of ring increaseNo relation between the size of the ring & couplingRemains sameDecrease as the size of ring increase