Naming Benzene - Video Tutorials & Practice Problems
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concept
Monosubstituted Benzene
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30s
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Here in this video, we're gonna take a look at naming mono substituted benzene. Here, we're going to say a mono substituted benzene is a compound where benzene is the parent chain with only one substituent. Now, here, this represents the simplest benzene to name and because there's only one substituent, the location of that substituent is not necessary. So in terms of our naming convention, we have our substituent name followed by the end of the name as benzene.
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example
Naming Benzene Example
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48s
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For this example question, it says give a systematic name of the following compound. So here we have benzene and connected to it is this alko group. Now, this alko group has four carbons involved, which means that it could represent butyl iso butyl sec butty or turf butty. Here, we'd say based on the way it looks, we have our connection on this carbon here, which is connected to three methyl groups. This represents a turtle. So the name of the al Q group would be turk beetle. Remember there's a hyphen there and it's connected to a benzene. So we end the name with benzene. So this would be the name of our given compound Turk Buttle, benzene.
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concept
Disubstituted Benzene
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2m
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Hey, everyone. So in this video, we're gonna take a look at dye substituted benzene, which are compounds where benzene is the parent chain and it has two substituents. Now, these substituents are numbered in alphabetical order. So if we had, for example, fluorine and Bromine bromo comes before floro, so we'd start numbering at the BROMO position. Now here, this would tell us in terms of the naming convention, we'd say the location of each substituent. And at the end of the name, we'd say Benzi. Now benzene itself is pretty unique because we couldn't number where these two substituents are numerically as 1213 or 14 or we could do a brand new way of designating their locations in the form of Ortho meta and Pera here in this example, these are all di chloral benzene. The chlorine are in different locations. Now, here there are positions one and two in this first image here. When they're in new positions one and two, we say 12 Diora or we could say Ortho in the next one, they are 13 to each other. So instead of saying 13, Di Chloro, we could say Meta di Chloro. And then finally, there are positions one and four here. So we have 14 Di Chlor Bene or we could say para di chloral. Now, the two substituents don't have to be the same. They could be the same or they can be different from each other. This Ortho Meta and Para Convention still would work. Now, our memory tool here to help us remember the order is order more pizza. Now, I know in college a lot of us kind of survive on pizza. At least that's the way it was for me when I was in college. So order more pizza, gives us the letter designation of 1213 and 14, order 12 Ortho more 13 meta and pizza 14 pera, right? So keep that in mind, we can name these two substituents by our traditional numerical method or we could do Ortho Meta and Pera.
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example
Naming Benzene Example
Video duration:
1m
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Here in this example question, it says give a systematic name of the following compound. In this compound, we have our benzene ring connected to two al heel groups, which happened to be ethyl groups. They're both two carbon chains. Now, here you could start numbering on either carbon position on benzene because they're both the same. So this could be 123 or we could go the other way, 123, five and six. So we have two eels in positions one and three. So their numerical location is 13, there's two of them are the same. So it's die and they are Ethel and we end a name with benzene. So this would be our systematic name. So this would be our answer. Now, if they wanted us to give the common name, if we wanted to with the use of Ortho meta or Pera, since it's 13, we'd say that the more common way of naming it is meta di ethyl benzene. Although the question doesn't ask this, I'm giving it to you just so you can see the differences between the two answers. OK. But our official answer is 13 di ethyl benzene.