13C NMR practice test problems

13C NMR practice test problems with a detailed solution. This session helps to analyze students learning achievements.

Challenge Yourself!!! ALL THE BEST…

1. 4-Hydroxybenzoic acid exhibited signals at 171, 162, 133, 122 and 116 ppm in its broadband decoupled 13C NMR spectrum. The correct assignment of the signals is

2. In the broadband decoupled 13C NMR spectrum, the number of signals appearing for the bicyclo octane A–C, respectively, are

3. Indicate the number of signals in the off-resonance 13C NMR spectra of the following compounds:

4. Indicate the number of signals in the off-resonance 13C NMR spectra of the following compounds:

5. Indicate the number of signals in the off-resonance 13C NMR spectra of the following compounds:

6. A compound with molecular formula C5H10O gave the following CNMR spectral
data:
(i) One singlet,
 212
(ii) One doub1et,  42
(iii) One quartet,
 27
(iv) One quartet,
 18
Deduce the structure of the compound consistent with the given data

7. Indicate the number of signals in the off-resonance 13C NMR spectra of the following compounds

8. The number of signals that appear in the broadband decoupled 13C NMR spectrum of phenanthrene and anthracene, respectively are

9. Match the following
Compound 13C NMR chemical shift
(A) Acetic acid                    (i) 95
(B) Acetonitrile                  (ii) 115
(C) Acetone                        (iii) 175
(D) Carbon tetrachloride (iv) 205

10. Analyze the CMR spectral data and correlate them to the structures of the two isomeric hexenes.

I 14.3, 20.6, 131.0 II 13.9, 25.8, 131.2


 

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