OC chad quiz error?

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the solution says it's SN2 reaction but if you look at the answer, -SCH3 didn't get inverted.
is this an error?

the nucleophile is the S therefore the inversion is on the other molecule. but since it has no chiral centers there is no observable inversion.
 
This one tripped me up today as well. Yikes. DAT is TOMORROW (today). I can't believe it.
 
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