Alright guys. So let's take a look at the AL keen aspect now of hydrocarbons. So here all kinds are hydrocarbons that contain at least one double bond. Now, once you start adding double bonds which are pi bonds, you become unsaturated unsaturated just refers to the carbon. Not having the maximum amount of hydrogen is possible here. The double bonded carbons are connected to three electron groups. So those double bonded carbons have an SP two hybridization. And now here What we need to realize is if we take a look at F 18 F ethane waas, those two carbons, each one connected to three hydrogen, notice the difference between them in the al cane version. Both carbons have three hydrogen, but once we create that double bond, what happens? We lose two hydrogen as a result. Why? Because here, those carbons can't be allowed to continue. Having three Hydrogen is each. Because then, if we take a look at this carbon, it's making 12345 bonds. Carbon cannot make more than four bonds, so the trade off is this. If you lay down an extra bond, you have to give up a hydrogen and Since we're laying down an extra bomb between these two carbons, they each have to give up one hydrogen. So here, same thing here. It should have had an H year. And actually, it shouldn't have this h here at all. So make sure you do a correction of this. There shouldn't be an h there at all, because that carbon is making five bonds. So we removed that age there, so I'll make sure to correct that on the pdf guys. But make sure that you realize right now that that carbon should not have to bonds on two hydrogen on it should only have one. So let's think about this. We're gonna say here that the formula for an al que nous c n h two n plus two. When we put down a double bomb, we lose two hydrogen. So all the form of an AL Keen be what we lose two ages so that two wouldn't be there anymore. So the generic formula for now keen with only one double bond will be C N h two n. So again, this is the generic formula for an AL Keen with Onley one double bond. But it also represents the formula for cyclo. All came because if we think about it, this cycle walkin, if we look has six carbons in it. Remember every and every corners of carbon, each one we see making to bonds so each carbon has to hydrogen is we don't see, so the formula of this thing would be C six h 12. It has the same exact formula as a now keen ah compound with only one double bond. Why? Because the al cane form should have been C six h two times six plus two, So that have been C six h 14. What's the difference? We lost two hydrogen in order to make a ring. So when you make a double bond, you have to give up to hydrogen. And when you make a ring, you have to give up to hydrogen. That's why they have similar formulas here. This is just the basics in terms of identifying, uh, the formulas for an Al Keenan, a cyclo all cane when you move on to organic and I'm saying that a lot you can get more and more complex types of molecules. We'll see a few today, but just realize that get more and more complex. Now that we've seen this, let's see if you guys can try to answer this question here. So I just need the formula, the simplest possible name of Ah, hydrocarbon that contains one double bond and six carbons. Attempt this on your own and then come back and see how I best approach it.