Infrared spectroscopy Quiz
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5 questions, one answer each
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1. A spectrum shows a strong absorption at 1720 cm⁻¹ and no O–H absorption. Which bond is responsible for the 1720 cm⁻¹ absorption?
- A. C–O
- B. C=C
- C. C=O
- D. C–H
2. A very broad absorption at 2500–3000 cm⁻¹ is characteristic of which group?
- A. Alcohol O–H
- B. Carboxylic acid O–H
- C. C=O
- D. C–O
3. What is the 'fingerprint region' used for?
- A. Identifying a compound by comparison with a database
- B. Measuring relative molecular mass
- C. Counting the number of carbon atoms
- D. Finding the boiling point
4. A pure sample has no O–H bond, but its spectrum has a broad absorption at 3350 cm⁻¹. What does this suggest?
- A. The sample is a pure ketone
- B. The sample contains a C=C bond
- C. An impurity containing an O–H bond, such as water or an alcohol
- D. The sample is a carboxylic acid
5. Why does carbon dioxide contribute to global warming?
- A. It reflects visible light from the Sun
- B. It absorbs ultraviolet radiation
- C. It is produced only by volcanoes
- D. Its bonds absorb infrared radiation emitted from the Earth's surface