CCl2 free radicals were produced by a pulsed dc discharge of CCl4 (in Ar). Ground electronic state CCl2((X) over tilde) radical was electronically excited to (A) over tilde B-1(1)(0,4,0) vibronic state by Nd:YAG laser pumped dye laser at 541.52 nm. The laser induced fluorescence signal is observed to be a monoexponential decay curve corresponding to the decay of the A state under supersonic jet conditions and the lifetime of CCl2((A) over tilde -->(X) over tilde) transition was measured being 0.83 +/-0.03 mus. Experimental quenching data of excited CCl2((A) over tilde B-1(1) and (a) over tilde B-3(1)) by alkanes were obtained by observing the time-resolved total fluorescence signal of the excited CCl2 radical in a cell, which showed a superposition of two exponential components under the presence of a quencher. The quenching rate constants of (A) over tilde(B-1(1)) and (a) over tilde(B-3(1)) states of CCl2, K-A, and K-a, were derived by analyzing the experimental data according to a proposed three-level model to deal with the CCl2((X) over tilde (1)A(1),(A) over tilde B-1(1),(a) over tilde B-3(1)) system. K-A and K-a increase steadily by increasing the number of C-H bonds contained in the alkane molecules. The formation cross sections of the complexes of electronically excited CCl2 radicals and alkane molecules were calculated by means of a collision complex model. It is shown that the dependence of the formation cross section of the complex on the number of C-H bonds contained in the alkane molecule is in agreement with that of the measured quenching cross section.