Question

Sn2 reaction - sketching molecular orbitals

The equation can be seen in the picture. I was assuming it was an Sn2 reaction given the polar aprotic solvent and strong nucleophile.


For b), I assumed that the question asked me to draw the orbitals as shown above (as opposed to orbital diagram) because it asked me to identify the HOMO and LUMO.


I'm confused as to where SEt (-) attacks/how to draw the attack i.e. the reaction itself as both steps occur at the same time. Also I'm assuming that the orbital around S is the HOMO and the orbital around C the LUMO. Is that correct?

Screenshot_20200802-181752.jpg

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Oops the second picture with my attempt didn't upload for some reason so here! 

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