The functional group region in infra-red spectrum lies between:
Correct answer: C. 1500 - 4000 cm-1
- A. 500 - 1300 cm-1
- B. 600 - 1500 cm-1
- C. 1500 - 4000 cm-1
- D. 2500 - 3500 cm-1
Explanation
The functional group region in an infrared spectrum ranges from 1500 to 4000 cm-1. This is where the characteristic absorption peaks of various functional groups, such as -OH, -NH, and C=O, are typically observed. Option A (500 - 1300 cm-1) and Option B (600 - 1500 cm-1) fall within the fingerprint region, which is known for the unique absorption patterns of entire molecules rather than specific functional groups. Option D (2500 - 3500 cm-1) is a subset of the functional group region, but it doesn't cover the entire range where functional groups can be detected, making Option C the most accurate choice.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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Spectroscopy studies how substances absorb, emit or interact with electromagnetic radiation. Coverage includes ultraviolet-visible absorption, infrared identification of functional groups, Beer-Lambert law, spectral interpretation and the use of spectroscopic data to identify or determine the concentration of chemical substances.
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