Photochemical synthesis of organic molecules with the help of U.V and using various catalysts to prepare alkanes, alkenes, alkynes, alcohol, aldehydes, ketones, acids and amides which are prepared by new methods.Various cyclic compounds, industrial purpose and medicinal fields are applicable. These compounds are used for the treatment of various diseases. Heterocyclic compounds are also synthesized like four membered, five membered and six membered which are used for the treatment of cancer and other chronic diseases.Various medicines are also prepared by these compounds.