(a) Sketch the pi molecular orbitals of hexa-1,3,5-triene (Figure 15-25). (b) S...

(a) Sketch the pi molecular orbitals of hexa-1,3,5-triene (Figure 15-25).

(b) Show the electronic configuration of the ground state of hexa-1,3,5-triene.

(c) Show what product would result from the [6 + 2] cycloaddition of hexa-1,3,5-triene with maleic anhydride.

(d) Show that the [ 6 + 2] cyclization of hexa-1,3,5-triene with maleic anhydride is thermally forbidden but photochemically allowed.

(e) Show the Diels–Alder product that would actually result from heating hexa-1,3,5-triene with maleic anhydride.