The “effective potential” for each system, nitrogen, argon, krypton, xenon, methane, benzene, carbon tetrachloride, carbon disulfide,n-hexane and cyclohexane was calculated by using the Clausius-Mossotti, Onsager and Kirkwood reaction fields with Lennard-Jones and Kihara potential parameters assumed. It was found that the Kirkwood reaction field with an assumed Kihara potential is a useful technique to study interactions arising due to physical association and chemical bonding.