The concentration dependent static dielectric constant, high frequency limit dielectric constant (square of refractive index), excess dielectric constant, and the effective Kirkwood correlation factor of the binary mixtures of water with formamide, N,N-dimethylformamide, N,N-dimethylacetamide, ethanolamine and N,N-dimethylaminoethanol, over the entire mixing range have been determined at 30°C. The values of these functions emphasize on the hydrogen bond interactions between the unlike molecules in water-amides and water-amines mixtures, the nature of which depends on the extent of substitution of the amides/amines. The concentration dependent values of excess dielectric constant were used to analyze the hydrogen bonding complexes formed between unlike molecules, the stoichiometric ratio of a stable adduct, and the strength of molecular connectivities in the binary mixtures.