 Let's try this problem now How many primary secondary tertiary and quaternary carbons does this have this compound have? Remember primary carbons are the carbon only has One other carbon bond into it secondary set two tertiary set three and quaternary set four Okay, so let's go ahead and look around this molecule. So I can see now If I have three so all carb all these carbons have four bonds to them So if a carbon has three hydrogens bonded to it in particular It's a primary so we can see this carbon here has three hydrogens bonded to it This one has two so let's just put these down. So this is the primary three hydrogens This one has two hydrogens. So it's a secondary This carbon here remember, that's a carbon. It has one carbon two carbons three carbons bonded to it So it's a tertiary carbon This is a carbon here. So it's got one two carbons bonded to it. It's a secondary where it's hydrogens. Well Remember they're understood to be there So we don't always show it in an organic chemistry So here's another secondary. Here's another secondary Here's another secondary Here's a carbon one two three carbons. So that's a tertiary carbon bonded to one Two other carbons or you can see the two hydrogens. So that's a secondary carbon bonded to one hydrogen So one hydrogen that's going to be tertiary carbon Here's a carbon bonded to three hydrogens So that's going to be a primary carbon because it's only bonded to the one other carbon and this carbon is also a primary carbon Okay for the same reason So let's just go ahead and count up all of our Numbers now. So we got one so one two three primaries Secondaries one two three four five six Secondaries Tertiary one two three Quaternaries No All right, so three six three. So there's twelve. So let's just make sure How many carbons we got one two three four five six seven eight nine ten eleven twelve So that about does them all do some more of these in a little bit