Chapter 25, Problem 25.15YT

Interpretation Introduction

Interpretation:

Out of the given options, which hydrogen atom abstraction steps will precede faster is to be determined.

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.