Which one is the wrong statement?

The uncertainty principle is $\mathrm{\Delta }E\times \mathrm{\Delta }t\ge \frac{h}{4\pi }$

Half filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement.

The energy of 2s-orbita1 is less than the energy of 2p-orbital in case of hydrogen like atoms.

de-Broglie's wavelength is given by $\lambda =\frac{h}{mv},$where m = mass of the particle, v =  velocity of the partice.