This question gives us some compound names and assets started to identify the ones that are named incorrectly and correct them. So I think the easiest way to do is to draw out each of these and then, uh, take a look at the name So four fl to pen time. So we have one two Penn tiene three four has an ethical sighs groups that should be free. So we look at this. The longest chain actually isn't five. It's six like this. So this should be 1234 metal, um, to hack sign B is one bro mo for hep time. So if we draw that out one, this has a browning on it. Teoh 34 has our O'Kane. That's five, six, seven. Um So if we look at this one, we want the out kind to be the lowest number that can that takes precedence over the bro. Mean? So in that case, we actually want a number. From this direction will be 1234567 So this would be seven, bro mo three. Have time to make it correct for See, we have to metal three. Heck, sign. So one two has a methyl group three is are all kind of four 56 So for this one, this is a symmetric here. If we ignore the metal group, it's a symmetrical l kind. So Thea kind is on number three, no matter which way we go from that. So in that case, we do want the metal to be the lower number that it can be. So this one is correct. Um, and then for D three pen tiene so one, 234 five Um, So again, we want all kinds been lowest number that it can be. And here it is not. This would actually be one too who went from the other side. This should be called to Penn tiene.