Chapter 15, Problem 15.8P

Interpretation Introduction

Interpretation: The value of $\Delta \text{H}°$ for the rate determining step of the reaction of ${\text{CH}}_{\text{4}}$ with ${\text{I}}_{\text{2}}$ is to be calculated. The reason corresponding to the fact that this reaction is extremely slow is to be explained.

Concept introduction: Halogens react with alkanes in presence of heat or light to form alkyl halides. This is known as halogenation reaction. This is a free radical substitution reaction. In these reactions, the halogen substitutes the hydrogen atom from $\text{C}-\text{H}$ sigma bond of the alkane.