Synthesis of chiral drugs required chiral starting materials organic compounds. DL serine is an amino acid that is used as a key starting material in the synthesis of many drug substances. D or L isomer of Serine will lead to the chiral drug substances whereas DL mixture will lead to racemic drug substances. FTIR can be used as the primary analytical tool for the identification of Serine isomers and its racemic mixture. Many absorption bands in FTIR spectra identify whether a molecule is a specific isomer or racemic mixture. A systematic comparison of FTIR spectroscopic data is carried out revealing that the compound is the specific isomer and the racemic mixture shows different spectra with different bands.