Spectroscopy is the study of the interaction between radiation (electromagnetic radiation, or light, as well as particle radiation) and matter. Spectroscopic methods are generally used to measure the energy difference between various molecular energy levels and to determine the atomic and molecular structures. Vibrational spectroscopy is of unique value as an analytical technique for quantitative determinations. In the present study FTIR (Fourier Transform Infra Red) technique is used for the analysis Nilavembu Kudineer Churanam and Acetominaphen and has been recorded in the region 4000-400 cm-1. The important vibrational assignments are discussed.