AbstractDichloromethane, chlorofluoromethane, and dichlorofluoromethane have been brominated competitively with each other and with chloroform and methyl chloride. Using the literature values for the rates of bromination of these latter two compounds, the rate constants for the three former compounds have been determined:\documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{l} k_2 ({\rm CH}_{\rm 2} {\rm Cl}_{\rm 2} {\rm)} = (9.77 \pm 1.44) \times 10^9 \exp (- 10,860 \pm 480{\rm cal}/RT) \\ k_2 ({\rm CH}_{\rm 2} {\rm F Cl)} = (7.76 \pm 1.59) \times 10^{10} \exp (- 14,800 \pm 800{\rm cal}/RT) \\ k_2 ({\rm CHF Cl}_{\rm 2} {\rm)} = (1.05 \pm 1.48) \times 10^{10} \exp (- 13,300 \pm 570{\rm cal}/RT) \\ \end{array}$$\end{document}whereRis taken to be 1.987 cal deg−1mol−1(1 cal = 4.186