Discussion
Why can a weak band near 3400 be mistaken for a hydroxyl group?
Answer: C
The first overtone of a carbonyl near 1700 lands close to 3400, where a hydroxyl or amine stretch would also appear, and it is weak enough to be overlooked as an impurity. Amines do absorb nearby, which is a separate confusion, and background and moisture are instrumental rather than intrinsic. Checking whether a weak band is near twice a strong one is the quickest way to rule out an overtone before reporting a functional group.
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