A dynamic recirculating still has been used to determine isobaric vapour-liquid equilibrium data for the systems tetrahydrofuran, tetrahydropyran, 2-methyl-tetrahydrofuran, and 2,5-dimethyl-tetrahydrofuran + chlorobenzene at 40.0 and 101.3 kPa. The experimental data for all systems were checked for thermodynamic consistency using the point-to-point method of Van Ness, The systems present negative deviations from ideality and none of them show azeotrope, The VLE data have been satisfactorily correlated with the Wilson, NRTL and UNIQUAC equations, Predictions with the ASOG and UNIFAC methods were also included.