Infrared spectroscopy Quiz
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5 questions, one answer each
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1. A spectrum has a strong absorption at 1710 cm⁻¹ and no absorption at 3200–3600 cm⁻¹. Which compound is consistent?
- A. Ethanol
- B. Propanone
- C. Propene
- D. Propylamine
2. Which absorption shows that a compound is an alkene?
- A. 1620–1669 cm⁻¹
- B. 1680–1750 cm⁻¹
- C. 3200–3600 cm⁻¹
- D. 3300–3500 cm⁻¹
3. Which feature identifies a carboxylic acid?
- A. A sharp peak at 3500
- B. Only C–H absorptions
- C. A very broad absorption at 2500–3300 cm⁻¹ and C=O
- D. N–H at 3350
4. The spectrum of a product shows no O–H absorption and a strong peak at 1730 cm⁻¹ after distilling an oxidised primary alcohol. The product is probably...
- A. A carboxylic acid
- B. An aldehyde
- C. An alkene
- D. An amine
5. Which compound shows an absorption at 3300–3500 cm⁻¹ and no C=O absorption?
- A. Ethanal
- B. Propanone
- C. Ethanoic acid
- D. Propylamine