Discussion
An unknown gives the following bands.
| Wavenumber | Appearance |
|---|---|
| 3300 | Broad, strong |
| 2950 | Medium |
| 1050 | Strong |
What is the most likely functional group?
Answer: C
A broad hydroxyl stretch with a strong carbon-oxygen single bond band near 1050 and no carbonyl at all points to an alcohol. An acid would show a carbonyl near 1710 as well, a ketone would show the carbonyl and no hydroxyl, and a nitrile would show a band near 2250. Reading what is absent alongside what is present is what makes this assignment secure rather than merely plausible.
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