Class 12 Chemistry · Chapter 14 · Test 3
13C NMR Spectroscopy
43 MCQs
43 questions · 35 min · 43 marks
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Sample questions
The first 5 of 43. Try each one, then tap to see the answer.
Question 1
Which carbon isotope is NMR active?
- A13C
- B12C
- C14N
- D16O
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Answer: A
The 13C nucleus has magnetic spin.
Question 2
The 13C nucleus has magnetic spin because it has:
- AAn even number of neutrons
- BNo protons
- CAn odd number of neutrons
- DA full shell
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Answer: C
12C has an even number of protons and neutrons so it is inactive.
Question 3
The chemical shift range of 13C NMR is:
- A0-12 ppm
- B0-50 ppm
- C0-100 ppm
- D0-220 ppm
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Answer: D
This is much wider than the range for protons.
Question 4
The reference for chemical shift in 13C NMR is:
- ATMS at 0.0 ppm
- BWater at 0.0 ppm
- CBenzene at 7.0 ppm
- DChloroform at 0.0 ppm
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Answer: A
As in 1H NMR the reference is TMS.
Question 5
The deuterated solvent CDCl3 gives a small signal in the 13C spectrum near:
- A0 ppm
- B80 ppm
- C180 ppm
- D220 ppm
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Answer: B
The text states this signal is near 80 ppm.
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