Distinguishing Structural Isomers: Mono- and Disubstituted Benzene Rings

Following up on the last installment, we examine the infrared (IR) spectra of mono- and disubstituted benzene rings. We examine numerous example spectra and learn how the position of C-H wagging peaks, and the presence or absence of a ring-bending peak, allow one to distinguish between mono-, ortho-, meta-, and para-substituted rings most of the time.