Chapter 25, Problem 25.16YT

Interpretation Introduction

Interpretation:

${\text{ΔH}}^{\text{°}}{}_{\text{rxn}}$ for each hydrogen abstraction step depicted in Figure $\text{25-10 }$ is to be calculated using Table25-1.

Concept introduction:

The rate of halogenation increases with increasing stability of the alkyl radical that is produced on hydrogen abstraction. Thus, not only does radical halogenation tend to be faster at $\text{2°}$ carbons than $\text{1°}$ carbons, but it also tends to be faster at $\text{3°}$ carbons than $\text{2°}$ carbons. Halogenation is particularly favored when hydrogen abstraction produces a resonance-stabilized alkyl radical.

Free radical bromination of an alkane is much more selective than free radical chlorination.