 One last note before we do though. Now that we have two functional groups it's important to note that you must number your main chain so that the highest priority functional group gets the lowest possible number. Okay some fairly easy ones first to show you how to deal with alkenes and alkynes that have extra functional groups. Here we have something that's both an alkene and an alcohol. Alcohols come further up the priority list so the name is going to end in all. There are five carbons so it's based on pentane but there's a double bond so that makes it pentene and then we add the all and that gives us pentene all. However we need to put in some numbers to say where the OH and the double bond are. So we number from the alcohol end and that gives us pentene one all. Okay next this is an alkyne but also a ketone. Note that the carbonyl group is not on an end carbon. So we find the main chain that's seven carbons long and it has a triple bond so that makes it heptine and it's a ketone so then we add the own suffix and it becomes heptine own. Now we need to number those functional groups as before so we start from the right and that gives us hept three-ine two-one. And lastly there's this methyl group here on carbon number five as a substituent so we end up with five methyl hept three-ine two-one. Okay now for a couple of trickier ones. First one find the main chain. Here it is and it's seven carbons long so it's heptane. It has a carboxylic acid group on this end and an alcohol group in the middle. Of those two the carboxylic acid has the higher priority so the root of the name is heptanoic acid and now we just have to treat the alcohol as a substituent. You'll see from your notes that when an alcohol group is not the priority group it's known as hydroxy and in this molecule it's on carbon number four, numbering from the right where the carboxylic acid is. So that gives us four hydroxy heptanoic acid. Okay the second one the main chain here is six carbons long. The two functional groups are a ketone and a carboxylic acid. Again the acid wins in terms of priority so we have hexanoic acid and our list tells us that when the ketone is not the priority group it's known as oxo and here it is on the fourth carbon so this molecule is four oxo hexanoic acid.