A strong, sharp absorption near 1715 cm-1 in an infrared spectrum most likely indicates which group?
Answer and explanation
Correct answer: D. A carbonyl (C=O) of a ketone
- Step 1: Carbonyl stretching gives one of the strongest bands in the spectrum, near 1700 to 1750 cm-1. Step 2. A ketone is near 1715. Answer: a carbonyl. Why not the others: a nitrile absorbs near 2250 cm-1, and O-H and N-H absorb above 3200 cm-1.
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