Frontier Molecular Orbital Theory Problem

AI Thread Summary
The discussion centers on the difficulty of drawing the highest occupied molecular orbital (HOMO) for the hydroxide ion (HO-) in relation to its interaction with the lowest unoccupied molecular orbital (LUMO) of H-Cl. The user is confused about the correct representation of the HOMO, as their understanding based on classroom instruction differs from the textbook's answer. They seek clarification on the number of valence electrons for O- to resolve their confusion. The user has shared their own attempt at the HOMO diagram for feedback. Assistance is requested to move forward with the problem.
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Summary: How do I draw the HOMO of HO-. The problem asks about the HOMO of HO- interacting in different ways with the LUMO of H-Cl. I cannot proceed with the question without figuring out how to draw the HOMO of HO-. I have attached pictures.

Hello All,
I have been struggling with this problem for some time now. My teacher and book has shown us how to draw MO's with just 1 set of valence electrons, so it is a sort of condensed MO diagram (just a heads up). I am confused on how my book is drawing the HOMO (highest occupied molecular orbital) for HO-.
I have attached my work for what I think the HOMO is, but the books answer is completely different and it has completely stopped me cold in my tracks from progressing.
Any help would be much appreciated.
 

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How many valence electrons does O- have?
 

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