In an infrared spectrum, a strong, broad absorption near 3300 cm-1 is most characteristic of which functional group?
Answer and explanation
Correct answer: A. An alcohol O-H
- Step 1: Hydrogen-bonded O-H stretching gives a broad, strong band between 3200 and 3600 cm-1. Step 2. A carbonyl absorbs near 1700 cm-1. Answer: an alcohol O-H. Why not the others: C=C absorbs near 1650 cm-1 and alkane C-H near 2900 cm-1.
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