The perturbation to the electronic structure of the molecules has been modeled with a point charge placed 10 Å away from the terminal carbon. Since Friedel oscillations are reflected from the structure's borders, cumulene and polyyne chains have been constructed to have one hundred carbon atoms each to accommodate a Friedel oscillation generated by the external point charge. We have conducted calculations involving -0.5e, -1.0e, -1.5e and -2.0e point charges.