Since the unimolecular decomposition rate constants for the secondary alkoxy radicals with C4 carbons, are ~104 s-1 (Atkinson and Arey, 2003), the reactions of the types (7.23), (7.24) and (7.25) can occur in parallel to give hydroxyl aldehyde, aldehyde with the same carbon number as the reactant alkanes, and aldehydes with one carbon less than the original alkane, respectively. The rate constants of for the isomerization reaction, reaction with O2, and the unimolecular decomposition reaction of typical alkoxy radicals are given by Finlayson-Pitts and Pitts (2000).