Hmm. If you made it through two semesters of orgo without genchem, your ability is probably sufficient to handle taking genchem out of order IF you have a very strong high school chem background AND are willing to spend extra time teaching yourself stuff from genchem I if you find yourself needing it for II. Be aware that genchem II is quite difficult, on a par with orgo II in my opinion. But hey, genchem I would be a cakewalk afterward. It's up to you, I guess, to weigh how important it is to you, how much advantage you'd gain by doing it and whether it would outweigh the increased difficulty.