Биотехнология = Biotechnology. Учебное пособие по английскому языку

the names that everyone uses”. So here's a couple of common benzene deriva­tives so if you have this molecule right here, if you have this molecule right here, I would actually draw the PI electrons as a circle. Actually, I'll draw it with the double bonds. So let's say you have this molecule right here and over here you have noh8 right there this is called a phenol. This is called a phenol, so it's not called benzene anymore and if you had a molecule that look like this, just like a phenol, so it's essentially it is a phenol. But let's say you have a bro­mine right there, what you do is you start numbering at the group, that's making this a phenol. So you start numbering there. One and then you get to the two. So this is two bromophenol and unfortunately this is one of those things you just kind of have to memorize. That a phenol is really just a benzene ring with an OH group. Another one that is probably a good idea to memorize. I mean at least for me and organic chemistry the most confusing thing is when someone says the name of a molecule that it sounds like they expect you to understand but you don't understand it. So it's I guess a good idea to understand as many names as possible. So if you just have a benzene ring and then you just have a methyl group attached to that benzene ring this is called toluene. And once again if you had a fluorine right over there this would be one, two, three, four O2 toluene. Now a couple of other ones that you will see and once again as you know if you watched many Khan Academy videos, I hate memorizing things, but these are just names and these aren't systematically derived. The chemistry community just uses them because that's the way they name them. So it is one of those things you kind of have to memorize. So if you have a benzene ring where the functional group, that's kind of defining the benzene ring, it's essen­tially becoming a mean. We haven't actually covered videos on means yet, and I'll do that in a future video but it's essentially, it's replaced one of the hy­drogen's in ammonia. Ammonia has three hydrogens and one lone pair here we've replaced one of the hydrogens. Actually, there's two hydrogens here we've replaced one of the hydrogens with a benzene ring. This type of thing you call it aniline. If I put a fluoro here, this would be two fluoro and allene. So you use whatever the base molecule is and then you just name it really the way we've named a lot of things before and I'll just introduce you to two more.