Molecular interaction on benzyl alcohol with formamides (formamide, N-methylformamide and N, N–dimethylformamide) in carbon tetrachloride for various molar ratios over the frequency at 9.36 GHz in 298K using X-band microwave bench technique (dielectric relaxation studies) were studied. The dielectric parameters like 0, , , and are calculated. In addition, the dielectric relaxation times ((1), (2), and (0)) have been calculated by employing Higasi’s method and the activation energies (F and F) have been determined using dielectric data. The most likely association between free hydroxyl groups of benzyl alcohol with the carbonyl group of formamides was studied. The result shows that the proton accepting ability of formamides is decreasing in the order: N-methylformamide> formamide> N, N-dimethylformamide and play an important role in determination of the strength of the hydrogen bond [O-H…C=O] is formed.
