Chapter 15, Problem 15.20P

Interpretation Introduction

Interpretation:

Based on the intensities of the $\text{C=C}$ stretching bands, each of the compounds shown are to be matched with its IR spectrum.

Concept introduction:

An oscillating dipole moment tends to be more pronounced for a stretching vibration when the bond is polar. A stretching mode involving a nonpolar bond (such as $\text{C=C}$) tends to have a weak or nonexistent IR absorption unless the two portions of the molecule connected by that bond are highly dissimilar.