Chemical reactions and charge-transfer processes in the CHCl2+ + D-2 system were investigated in crossed-beam scattering experiments. Experimental data were complemented by theoretical calculations of the energetics; of the species involved and by calculations of stationary points on the dication potential energy surfaces. The main reaction products were the cations CHCl+, CHDCl+, and CCl+. Integral cross sections for the formation of these species were determined over the collision-energy range of 0.4-2.5 eV (center of mass). Two isomers of the reactant dication were identified, with the H atom being bonded either to a C atom (HCCl2+) or to a Cl atom (CClH2+). The isomer CClH2+, which has a higher ionization energy than HCCl2+, was determined. to be responsible for most of the charge-transfer product (the formation of the ground and excited states of CClH+). The chemical reaction product CHDCl+ was formed in two processes of different translational-energy release via a long-lived or short-lived intermediate, and it could originate from both reactant dication isomers. The most abundant reaction product, CCl+, was formed mostly by a highly exoergic impulsive process; of proton transfer from the ground state of the dication HCCl2+ to D-2. This direct reaction of proton transfer seems to be a rather general chemical process in collisions of hydrogen-containing dications with neutrals of some proton affinity.