SN2 reaction inversion question

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ChEStud

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Hey guys,
I have a question about inversion in an SN2 reaction. When the nucleophile attacks the molecule, the stereochemistry inverts. I'm confused about the whole inversion concept. In some problems that my professor worked out, he switches the entire stereochemistry (IE. the atoms that are wedges becomed dashed and the dashes become wedged) but in some problems he just inverted the structure.
Such as this the Picture 1 molecule he didn't switches the wedged hydroxyl group to a dashed nucleophile. Can someone clarify the whole inversion concept?
Thanks!
 

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