Discussion
Consider the following pairs of band and its assignment.
3300 broad - Hydroxyl stretch
2250 sharp - Nitrile stretch
1650 medium - Amide carbonyl
1450 strong - Carbonyl stretch
How many of the pairs given above are correctly matched?
Answer: B
The first three are correct and the fourth is not, so three match. The region near 1450 holds methylene and methyl bending modes, while a carbonyl sits between 1650 and 1800 depending on its neighbours. Placing a band four hundred wavenumbers from where it belongs would misidentify almost any spectrum, which is why the carbonyl region's boundaries are worth knowing precisely.
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