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Solution: Give the IUPAC names of each of the following alkanes.  ...

Question

Give the IUPAC names of each of the following alkanes. 

Video Transcript

So, here we've got a sawhorse projection, right? But we're going to go ahead and convert it into bond line structure, so that we can more easily figure out its IUPAC name, so we know this is our front carbon, this is our back carbon, so we're just going to go ahead and say that we've got our two carbons here, we've got our CH3 group up here, on the, in the plane, right? And then all over here to the right that's going to give us our wedge ethyl group, which will look something like that. Now, over here on the Left we've got our two hydrogens on wedge and dash, so they're implied we don't need to draw them but then down here we have this C, CH3, 3, which tells me that we're going to have something like that, okay? we've got 1, 2, 3, 4 carbons there 1, 2, 3, 4 since we've got three of them here, so that's the correct number of carbons. Now, we need to figure out our longest chain so that we can draw our bond line and so we can get our name, so we're going to have something looks like this, alright? Here we've got six carbons, so I'm going to go ahead and draw this again a little bit differently, so there we've got our six carbons and here we've got, I'm just going to go ahead and give wedge and dash information here so that it's more clear exactly what's going on and then over here on carbon number four right one we've got 1, 2, 3, 4, we've got this carbon here. Now, I'm going to go ahead and number in blue here, 1, 2, 3, 4, 5 and 6 and in red 1, 2, 3, 4, 5 and 6. Now, should our number from the blue side, the blue pattern or should I follow red? Well, since we want to give our substituents the lowest number possible we absolutely have to go with the blue, okay? the red numbering is incorrect, so I'm going to go ahead and get rid of these, so now what we get is our, we know we have our root name, is going to be hexane, right? So this is our 1, 2, 3, 4, 5 and 6 positions and now we know that we have 3-methyl groups, right? So we can say that we got trimethyl, no space between trimethyl and the hexane and then here since we're going to go ahead and list the locations of each methyl we need to add a dash and saying we've got 2-methyl groups on the two positions, so we just say 2, 2 and then we've got a third one, right? on carbon number four, so we've got 2,2,4-trimethyl hexane, that tells us exactly the location and the total number of methyl substituents that we have on our hexane alkane, right? Okay, guys if you have any questions please feel free to let me know, if not, let's move on.

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