Question detail
In infrared spectroscopy, what does the fingerprint region represent?
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. The region where all functional groups absorb.
- B. The unique absorption pattern of a specific molecule.
- C. The region of highest energy absorption.
- D. The region where no absorption occurs.
Answer
The unique absorption pattern of a specific molecule.
Explanation
The fingerprint region in infrared spectroscopy represents the unique absorption pattern of a specific molecule. This region can be used to compare with reference spectra to identify unknown substances.
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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