Organic Chemistry
/ Cumulative General Concepts

- Solutions 26

Predict the bond angles for all bonds in the following compounds:

(g)C_{3}H_{8}

Hey guys. So, in this problem we need to go ahead and figure out the bond angles of C3H8, okay? So guys, what it does look like? well, it probably looks something like this, right? in fact before we even do that, how can we tell for sure? we can use IHD, right? Guys if we go ahead and do this, I'm going to save some time, right? 3 times 2 is 6 plus 2 that's 8. So, 8 minus 8 in our 2 n plus 2, right? We know that we have an IHD of zero, so we don't have any double bonds or rings, so what that tells us is that we've got something that looks like this. Alright we know we can't have any branches here because no matter where we add our third carbon we're going to get something looks like this, right? So guys if we take a look that just our three hydrogens here, our two here and another three there, so that's eight total, so I'm going to go ahead and draw this like this, H3, C, CH2 and we're going to get our CH3, okay? And guys there's something about this molecular you might be able to tell, all of them, right? Our sp3 hybridized, all of our carbons, right? So guys, all of our bond angles are going to be 109.5, okay? Really easy to tell when you have just an alkane and you don't have any rings or anything like that, right? Any of you did have an alkane ring it would still be 109.5 because it's one of sp3 hybridized, so guys, alkane, no hetero atoms, all going to be 109.5 degrees. Alright guys, let's move on.