Chapter 15, Problem 15.42P

Interpretation Introduction

Interpretation:

The given compounds using IR spectroscopy are to be distinguished.

Concept introduction:

The frequencies of the stretching vibrations are estimated from the type of bond and the frequency range given for that bond. Also, frequency range for the given type of bond is identified by the functional group to which that bond resembles in the molecule. An alcohol $\text{O-H}$ stretch is typically centered near 3300 ${\text{cm}}^{-1}$ and is usually well resolved from the alkane $\text{C-H}$ stretch bands between 2800 and 3000 ${\text{cm}}^{-1}$. A carboxylic acid $\text{O-H}$ stretch is centered at around 3000 ${\text{cm}}^{-1}$ and can extend down to 2500 ${\text{cm}}^{-1}$, thus overlapping the alkane $\text{C-H}$ stretches.