Measurements of dielectric constants and densities of solutions of different concentrations of furoin and hydrofuramide in benzene as also refractive index measurements for hydrofuramide, have been carried out and the dipole moments of the above substances calculated from values of ‘P’ arrived at by the application of the Hedestrand’s method of extrapolation. The values of dipole moments of the two substances are: Hydrofuramide=2·66±·01 D. Furoin 3·24 D. The structures of furoin and hydrofuramide have been discussed from the experimentally obtained values and those calculated for various positions of furyl groups in the latter and furyl and hydroxyl groups in the former by the method of vector addition of moments.