Organic Chemistry Multiple Choice Questions and Answers – Nuclear Magnetic Resonance – 1

Questions
1 Which of the following organic compound with molecular formula C3H C12 exhibits only one signal in the IH NMR spectrum?
A 2, 2-dichloropropane
B 1, 2-dichloropropane
C 1, 3-dichloropropane
D 1, 1-dichloropropane

Answer: 2, 2-dichloropropane
2 The 1H NMR spectrum of CH3OCHCICH2Cl will exhibit ________
A A three proton doublet. One proton singlet and a two proton doublet
B A three proton singlet. One proton singlet and a two proton doublet
C A three proton singlet. One proton triplet and a two proton doublet
D A three proton triplet. One proton triplet and a two proton triplet

Answer: A three proton singlet. One proton triplet and a two proton doublet
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3 Which of the following 1H-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?
A CH3NHCOOCH2CH3
B CH3CH2NHCOOCH3
C CH3OCH2CONHCH3
D CH3CH2OCH2CONH2

Answer: CH3NHCOOCH2CH3
4 Which of the following has three types of hydrogens in the following compounds?
A Br-CH = CH2
B CH3 – CH2 – CH3
C C6H5CH2
D CH3– CH2 – CH(CH3) – N02

Answer: Br-CH = CH2
5 Which of the compound show only one signal is present in the PMR spectra?
A C3H4, C3H6
B C4H6, C5H12
C C8H18, C2H6O
D All of the mentioned

Answer: All of the mentioned
6 How many Hertz does 1 ppm correspond to for an PMR spectrometer operating at a radio frequency of 60 MHz and 100 MHz?
A 6 Hz, 10 Hz
B 60 Hz, 100 Hz
C 100 Hz, 60 Hz
D 10Hz, 100Hz

Answer: 60 Hz, 100 Hz
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.
A Diethyl ether and n-butanol
B t-Butyl alcohol and 1-Methoxypropane
C diethyl ether and t-Butyl alcohol
D Diethyl ether and 2-Methoxypropane

Answer: diethyl ether and t-Butyl alcohol
8 The distance between the centers of the peaks of doublet is called as?
A Coupling constant
B Spin constant
C Spin-spin coupling
D Chemical shift

Answer: Coupling constant
9 H2, CH4, C2H6 and C6H6 exhibit which PMR spectra?
A Singlet
B Doublet
C Triplet
D Quintet

Answer: Singlet
10 A proton Hb is coupled to four equivalent protons Ha. The multiplicity and the relative intensity of lines in the signal Hb is?
A Doublet, I : 4
B Triplet, I : 4 : 6
C Quintet, 1 : 4 : 6 : 4 : 1
D Quartet, 1 : 4 : 6 : 4

Answer: Quintet, 1 : 4 : 6 : 4 : 1

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