Chapter 15, Problem 15.13P

Interpretation Introduction

Interpretation:

In the given reaction, $\text{HCl}$ involved in the rate-determining step or not is to be concluded.

Concept introduction:

According to the Lambert-Beer law, the measured absorbance $\left(\text{A}\right)$ is directly proportional to the concentration $\left(\text{C}\right)$, hence the initial reaction rate is simply the change in absorbance divided by time. Appling UV-Vis spectroscopy towards quantitative measurements where relative reactant and/or product concentration (that is the absorbance at ${\text{λ}}_{\text{max}}$) are monitored over time. The appearance of the peak at $\text{244}$ nm indicates about the progression of the elimination reaction, whereas the disappearance of the peak at $\text{244}$ nm indicates about the progression of the addition reaction.