I don't a top 4 school cared about my C+ in O-chem when they waitlisted me... also had 2 acceptances and 4 quality waitlists.
Either way, I don't think you should retake it. If it's your only C it won't matter, and if it is just one of many, you're not going to change your GPA. I think it's a waste of time, and that time should be spent on getting A's in your other classes.
There are two semesters of O-chem, so just make sure you crush the next semester.
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