Chapter 12, Problem 12.28SP

Interpretation Introduction

Interpretation: The explanation of how the IR spectrum of the product differs from that of the reactant; and the approximate frequencies for distinctive peaks in the IR spectrum of the reactant and also of the product are to be given.

Concept introduction: An IR spectrum is a graph for the energy absorbed by a molecule as a function of the frequency or wavelength of light. Alkanes, alkenes and alkynes have characteristic $\text{C}-\text{H}$ stretching frequencies. Isolated alkenes have a value of  $1640-1680{\text{cm}}^{-1}$ , and conjugated alkenes have $1620-1640{\text{cm}}^{-1}$ frequencies.

To determine: The difference in the product and the reactant in the IR spectrum; and the approximate frequencies for distinctive peaks in the IR spectrum of the reactant and also of the product.