00:01
Okay, so we're just to describe a homologous series.
00:02
Give examples what a methylene group is and how they differ.
00:08
So homologous series is that the carbons have similar properties or even similar functional groups.
00:15
So an example could be the alkenes.
00:24
And we can start with methane, which is ch4.
00:27
So in the series, the next one would be two carbons, which is ethene, ch3, ch3.
00:36
And the next one is propane.
00:37
We can draw like this or it would also be ch3 ch2 and this is followed by butane like that which is just ch3 with two ch2s and we'll just keep adding ch2s we can also have so if they contain similar functional groups let's see we look at alcohols and we'll start with ethanol so we have two carbons and the one carbon is bound to an oh group we can expand on this with perpennol and obviously keep expanding the chain while butanol because we have four carbons and fentanyl so all these have similar properties the only difference is that the branching that occurs at the in the middle and so we're asked what a methyling group is and this is really just a ch2 so it's present between two methyl groups is one right here and two here and the longer the chain the more methylene groups will have so if we drew a pentene, we'd have three methylene groups as opposed to two on butene...