The internal state distributions of HCl products from the reactions of Cl atoms with methane, propane, and isobutane are reported. These measurements were carried out using state-selective detection of the HCl(v,J) vibration-rotation states by resonance-enhanced multiphoton ionization (REMPI) in a time-of-flight mass spectrometer. The reactions were initiated in a crossed, pulsed-flow of the reagents by 355 nm photolysis of Cl-2 to produce the Cl atom reagents. The rotational state distributions in the observed HCl(v = 0 and 1) vibrational levels were found to be quite cold. The relative intensities of REMPI signals for the detection of v = 0 and 1 products were compared in order to gain a measure of the degree of vibrational excitation. Because of the known speed and angular distribution of the Cl reagents, it was possible to obtain information on the product center-of-mass angular distribution from measurement of the product laboratory velocity distribution; the latter could be derived from the observed mass 36 time-of-arrival profile. The HCl(V = 0) product from the Cl + isobutane reaction was found to be mainly backward scattered with respect to the incoming Cl atom. These observations of the product internal state distributions and angular distribution are consistent with a mechanism involving abstraction of hydrogen atoms from the hydrocarbon reagent through a collinear Cl-H-R geometry.