The kinetics of C6H5 reactions with c-C5H10, c-C6H12, C-C7H14, c-C8H16, and CCl4 have been studied by means of the cavity-ring-down technique in the temperature range 297-523 K. The rates of these reactions were monitored by measuring either the decay of C6H5 at 504.8 nm or the formation of C6H5O2 at 496.4 nm (or 510 nm) when a small, constant amount of O-2 was added to the slow-flowing reaction mixtures. Our absolute rate constants determined at several specific temperatures compare reasonably well with those measured in solution by either a direct probing (as for CCl4) or an indirect, relative rate method (as for the cycloalkanes). The effects of temperature on the reactions with CCl4, C-C5H10, and c-C6H12 have been investigated and our results give rise to the following Arrhenius equations : k(CCl4) = 10(-11.70 +/- 0.05) exp[(-1379 +/- 56)/T]; k(c-C5H10) = 10(-11.35 +/- 0.08) exp[(-2039 +/- 66)/T]; k(c-C6H12) = 10(-11.10 +/- 0.24) exp[(-1913 +/- 191)/T], where k(x)’s are given in units of cm(3)/molecules. Our averaged value of k(CCl4), at 333 K, 3.40 x 10(-14) cm(3)/molecules, was used to evaluate many rate constants for C6H5 reactions with hydrocarbons (RH) of interest to combustion using previously determined k(RH)/k(CCl4) ratios in solution.