- Concept Videos
- Solutions 63

Draw structures for all constitutional isomers with the following molecular formulas:

(a) C_{2}H_{6}O

Hey guys. So, in this problem we need to go ahead and figure out all the constitutional isomer for C2H6O, okay? And I'm justo going to go ahead and paste our IHD formula with it's qualifiers here to save some time, okay? So, we now that our IHD formula is used to figure out if we have any rings or double bond or whatever it is, right? Just essentially how many hydrogens are missing and what kind of patterns we can find, okay? So guys, if we go ahead and solve this, if we go ahead and plug in our numbers we know that we have, we got 2 times 2, right? That's two carbons, right? Plus 2, I'm just factoring this thing here and we have to substitute our oxygens, right? Not really because if you look our oxygens are equal to zero, so really it's just our 6 hydrogens, so we are going to do minus 6, all divided by 2, and guys, what is that equal to? Well, 2 times 2 is 4, plus 2 that's 6, minus 6, so we are going to get zero over 2, so no IHD, so guys, we can do something that looks like this, right? We have our two carbons here and now we need to add our OH somewhere, right? If we just have our 2 carbons like that we need to add our OH or an O, right? So, if we have an O we need to have a hydrogen attached because our oxygen likes two bonds, right? And if we take a look we got three carbon, three hydrogens over here, two hydrogens here, that's five, and here is a sixth one, so guys, what is this molecule actually called by the way, this is an ethanol, right? this is something, this is one of the structures that we can get from this formula, okay? What else can we do? Well, what if we had an oxygen in the middle, right? we have an oxygen like that and then we have to have two bonds right? And we just have our carbons on the other side, well, now everybody is happy, right? Our oxygen has it's two bonds and we have three hydrogens here, three hydrogens here, so six hydrogens total, so guys, these two are our constitutional isomers, alright? Let's move on.