The reactions studied were π-+p-->n+π0 (π0-->γ+e++e-) and π-+p-->n+e++e-. From a sample of ~15 000 internally converted electron-positron pairs, 7000 were measured, of which 4200 were used in the detailed analysis. The differential distributions in y (the energy partition) and x2 (the virtual mass of the photon) agree with the theoretical quantum electrodynamic calculations. A measure of the form factor for the π0-->2γ reaction gave a value Γ(xμ)=1-(0.24+/-0.16)x2μ2, where μ is the mass of the pion. It was further demonstrated that the number of events necessary to determine the contribution of the longitudinally polarized virtual γ rays in the second reaction is of the order of 50 times that in the present experiment.