The benzimidazole nitrogen containing heterocyclic ring which possess biological and pharmaceutical. These heterocycles are key components to functional molecules that are used in a variety of everyday applications. Synthesis of Benzimidazole and their derivatives using microwave irradiation.An efficient and green synthesis carried out using microwave gives high yield in short reaction time. Importance of the synthesized compound were screened for antimicrobial activity. Newly synthesized compound characterized by IR, H1NMR, U.V- visible.