A series of 7-[4-(5-aryl-1, 3, 4-oxadiazole-2-yl) piperazinyl] quinolones (I-XXI) were synthesized using an appropriate synthetic route and characterized by elemental and spectral analysis. The antibacterial activities of all the synthesized compounds were evaluated against identifiable bacterial strains. Compounds III, IV, VII, VIII, IX, X, XI, XV, &XVIII showed better activity than parent compound against all the selected strains. QSAR ...