Question detail
What is the role of infrared spectroscopy in identifying functional groups?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Organic analysis
Question
- A. It measures the density of the substance.
- B. It identifies the molecular weight of the substance.
- C. It detects specific absorption peaks corresponding to functional groups.
- D. It determines the boiling point of the substance.
Answer
It detects specific absorption peaks corresponding to functional groups.
Explanation
Infrared spectroscopy identifies functional groups by detecting specific absorption peaks in the infrared spectrum. Each functional group has characteristic absorption frequencies, which can be used to identify the presence of specific groups in a molecule.
Common mistake
Misunderstanding Infrared Absorption
Students often confuse the specific absorption peaks of gases like CO2, CH4, and H2O, leading to incorrect identification of functional groups.
To accurately identify gases using infrared spectroscopy, remember that each gas has unique absorption peaks. For example, CO2 absorbs around 2350 cm⁻¹, CH4 has peaks near 3000 cm⁻¹, and H2O shows strong absorption around 3400 cm⁻¹. Use these values to confirm the presence of each gas.
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