Use Tables 4.1 and 4.2 to help you answer these practice problems.

Name the straight-chain alkanes or cycloalkanes whose structure or formula is shown:

(b) C₆H₁₂

Video transcript

Welcome back, everyone provide the name for the straight chain alkane or cyclo alkane corresponding to the molecular formula C five H. To, for this problem, let's begin by comparing the given molecular formula to the general formula of an L cane. Now L canes, they have a general formula of CNH two N plus two. So in this case, if N is equal to five, then we can conclude that if this structure is actually an L cane, then the molecular formula should be C five H 12 because when we substitute 54 N, we get two multiplied by five plus T which is 12. And in this case, we have 10 hydrogens. So this is not an L cane, it must be a cycle L cane. And this is actually true because cycle L canes, they have a general formula of CNH two M. So if N is equal to five, then the number of hydrogen atoms will be 10. This is also the the general formula of L Keynes, right? But in this case, we are restricted to a cycle L cane. So what we can do is simply draw a five member grain because we have five carbon atoms. And that's it. On the other hand, we can draw a four member grain and we can just add that additional carbon as a methyl group, right? And then of course, the smallest possible ring that we can get is a three member ring. And we simply want to add two additional carbons as methyl groups and those to be at least three possible structures. We don't need to worry about all of them, right? We simply want to understand that we can choose any of those and we can go with the simplest one. And in this case, we can choose that five member ring. Now, in order to name it, we have to understand that if we have a cycle alkene with no, with no substituents, we are simply going to name it as cycle to begin with. And then we simply want to state the prefix for the total number of carbon atoms. So we have five within the ring and the prefix for five is Santa. Now, for the suffix, we're going to choose AM E right? Because it's an L cane or a cyclo Alcaine, the prefix doesn't change. So cyclops and that will be our final answer. We don't need to name the other ones because we simply have chosen the first structure. Thank you for watching.