"The exact path of electron in 2p-orbital cannot be determined." The above statement is based upon

Bohr's theory considers an electron as a material particle. Its position and momentum can be determined with accuracy. But, when an electron is considered in the form of wave as suggested by de-Broglie, it is not possible to ascertain simultaneously the exact position and velocity of the electron more precisely at a given instant, since, the wave is extending throughout a region of space.