Discussion
A spectrum shows a sharp band at 2250 and nothing near 1700. What is indicated?
Answer: D
A band near 2250 is the carbon-nitrogen triple bond of a nitrile, and the absence of any carbonyl rules out the other obvious assignment. Alkenes absorb near 1650 and alcohols near 3300. The triple bond region is nearly empty in most compounds, which makes any band there immediately informative - a nitrile, an alkyne or an isocyanate, and the three are distinguished by their exact position and intensity. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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