Set up the 4 x 4 secular determinant for a square planar H4 molecule using the Simple Hckel model. Expand the determinant and hence derive

Set up the 4 x 4 secular determinant for a square planar H4 molecule using the Simple Hückel model. Expand the determinant and hence derive the eigenvalues (energy levels) for this system. Plot the resulting MO energy diagram. Calculate the total energy of the ground state and the stabilization energy.