The adsorption behaviour of aliphatic carboxylic acids (ACA), amines (AAM), ketones (AK) and esters (AE) on the polycrystalline Bi \ electrolyte solution interface has been studied by the differential capacity-electrode potential measurement method. The values of the limiting Gibbs adsorption, interaction constant a(0) in the Frumkin isotherm, zero charge potential shift Delta E-sigma=0 due to the organic compound adsorption and other adsorption parameters have been obtained and compared with the corresponding values for linear aliphatic alcohols (AA). The dependence of Delta E-sigma=0 on the surface coverage theta has been discussed with the aid of Nikitas et al. model. The shape of the Delta E-sigma=0(-1), theta(-1)-plot depends on the hydrocarbon chain structure, a well as on the chemical nature of the functional group of organic compound studied.