The cross section of inelastic scattering of slow electrons at large angles with excitation of high-lying l+-states in 2~are calculated in DWBA. The calculations are carried out both in the random-phase approximation and with the interaction of one-and twophonon states in the framework of semi-microscopic quasi-particle-phonon model. A group of noncollective l+-states with a large excitation probability in backward (e, e')-scattering is found in the excitation energy region of 17-21 MeV. We discuss also the problem of existence, properties, and possibility of discovery the high-lying collective l+-states (2hco Ml-resonance) predicted by Speth et al.