Principles of NMR and carbon-13 NMR Quiz
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5 questions, one answer each
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1. How many peaks are in the ¹³C NMR spectrum of propan-2-ol, (CH₃)₂CHOH?
- A. 1
- B. 2
- C. 3
- D. 4
2. Why is TMS used as the standard in NMR?
- A. It reacts with the sample to give a large peak
- B. It has many carbon environments
- C. Its peak has a very high δ value
- D. It gives one sharp peak and is unreactive and volatile
3. A peak at δ = 205 ppm in a ¹³C spectrum most likely indicates which group?
- A. C=O in an aldehyde or ketone
- B. C=O in an ester
- C. C–O in an alcohol
- D. C–C in an alkyl group
4. Which compound gives only one peak in its ¹³C NMR spectrum?
- A. Ethanol
- B. Propanone
- C. Ethane
- D. Methyl ethanoate
5. What does a chemical shift of δ = 0 refer to?
- A. The peak for the C=O group
- B. The peak for TMS
- C. The peak for the solvent
- D. The most deshielded carbon