formaldehyde + 2 chloride + 2 H(+) => dichloromethane + H2O
formaldehyde + 2 chloride + 2 h(+) => dichloromethane + h2o
formaldehyde + 2 chloride + 2 H(+) => dichloromethane + H2O
formaldehyde + 2 chloride + 2 h(+) => dichloromethane + h2o