The equilibrium constant of the molecular association arises from hydrogen bonding of alcohols in carbon tetrachloride have been calculated by using FT-NMR spectroscopy data and mathematical models. To treat the thermodynamic behavior of the mixtures, association models such as dimer, continuous linear association model (CLAM), trimer, linear association with cyclic trimer association model (LACT), dependent equilibrium constant model (DECM), and dependent equilibrium constant and frequency model (DEFM) have been used to find the most proper model for alcohol + carbon tetrachloride mixtures. The activity coefficients for the mixtures have been calculated by various models and the results have been compared.