Question: MO diagrams for cyclic H N molecules are shown in Figure 6.1. (a) Sketch out the MOs and their relative energies for a square H

MO diagrams for cyclic H_N molecules are shown in Figure 6.1.

(a) Sketch out the MOs and their relative energies for a square H₄ molecule. Determine the number of nodal planes for each MO.

(b) This molecule is prone to a first-order Jahn–Teller distortion. How will the distortion change the shape of the molecule? Redraw the MO diagram after the distortion has taken place.

Figure 6.1

highest- 0-0 energy MO energy lowest- energy MO 0-0 H 14 He 14 14 14 14 11 H0 14 14 H4 --00000 |||||| |||||| ...00000... 00000... ...-00000... Hoo H

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