Which compound would be expected to show intense IR absorption at 1746 cm^-1?

Question

Quizplus · Accepted Answer

The intense IR absorption at 1746 cm^-1 is characteristic of the carbonyl group (C=O). Choice A and D both contain a carbonyl group, but they also have other functional groups that can absorb IR radiation, so they would not exhibit an intense absorption solely at 1746 cm^-1. Choice B contains a nitrile group (C≡N), which has an IR absorption peak around 2200 cm^-1, not 1746 cm^-1. Only choice C contains a single carbonyl group and no other functional groups that would interfere with its IR absorption in that region, making it the best choice.

Which Compound Would Be Expected to Show Intense IR Absorption