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Choose the molecules containing an IR stretching frequency of 3500-3000 cm-1.


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Correct Answer: D. All of them
The range 3500-3000 cm-1 is typically associated with stretches between heteroatoms and a hydrogen atom, for example NH and OH bonds. They may appear broad, intense and jagged (COOH), broad and smooth (OH) or less intense and sharper (NH). The preceding sentence is likely more than you would need to know for the MCAT. In general, for MCAT purposes, it is useful to remember approx. 3300 for hydroxyl and approx. 1700 for carbonyl (C=O).
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