Initiation

Propagation

First Branching

Forward

$\text{RIF}=\text{KIF}\times \text{H2}\times \text{O2}$

$\text{RPF}=\text{KPF}\times \text{HO}\times \text{H2}$

$\text{R1F}=\text{K1F}\times \text{H}\times \text{HO}$

Backward

$\text{RIB}=\text{KIB}\times \text{HO}\times \text{HO}/\text{2}$

$\text{RPB}=\text{KPB}\times \text{H}\times \text{H2O}$

$\text{R1B}=\text{K1B}\times \text{O}\times \text{H2}$