There is some questionable advice in this thread - be wary, OP. I have friends (with non-science backgrounds) who did just fine on the MCAT and got interviews from Harvard, Stanford, and other top schools without taking Orgo 2.
If you have done well in your other classes and done well on the MCAT, I don't think you need to take Orgo 2 for the sole purpose of proving to medical schools that you can handle a rigorous course. On the other hand, it might help sell your story and show that you've reinvented yourself if you're trying to recover from a bad undergrad GPA, or something like that. It probably depends on the specifics of your application.
I am not an AdCom and could certainly be wrong about this, but I don't think having Orgo 2 incomplete would hurt your application at all. Many/most schools no longer require it anyways.