Three reactions occurring on the C3H4Cl potential energy surface ( PES) were studied computationally using quantum chemistry and master equation/RRKM: CH2Cl + C2H2 -> Products (1), CH2CHCHCl -> Products (2), and CH2ClCHCH -> Products (3). The results indicate low importance of the 1,3-Cl shift channel linking the PESs of reactions 1 and 2 despite a relatively low energy barrier. Addition and chemically activated H elimination are the two major products of reaction 1, with branching dependent on pressure and temperature. Cl and cyclopropene are the major products of reaction 2, and CH2Cl + C2H2 - of reaction 3. (C) 2017 Elsevier B.V. All rights reserved.