Write the IUPAC name for each of the following: (12.3)
a.

Question

Write the IUPAC name for each of the following: (12.3)

a.

Accepted Answer

All right, hello everyone. So this question is asking us, what is the Iupac name of this structure? Option A says four Chloro three Ethyl Benzal Hyde. Option B says three eo four chloral Hyde option C says chlorine ethyl Benzal Hyde. And option D says Chloro ethyl benzoyl aldehyde. So let's go ahead and get started. Recall that the first step when it comes to finding an Iupac name is to always start with the parent chain of the molecule itself. In this case, the parent chain describes the longest continuous chain of carbon atoms that also incorporates the highest priority functional group if relevant. So in this case, recall that the highest priority functional group would be the car bono here on the right side of the structure. And carbonel refers to this carbon atom double bonded to oxygen. Now, because the carbon carbon is connecting to an atom of hydrogen, the highest priority functional group is an aldehyde. And in this case, the longest continuous chain of carbon atoms that incorporates the aldehyde is actually a benzene ring. So the Iupac name of a benzene ring with an aldehyde attached is Benzal Hyde. And so with this in mind, we can go ahead and focus our attention on the second step which is identifying any other substituents present in the molecule. But before we do that, actually, I want to talk about actually numbering the benzene ring because the aldehyde is the highest priority functional group. The carbon atom of the ring that's connecting to the aldehyde should be labeled number one. So I can label the rest of my ring either in a clockwise or counterclockwise direction depending on the locations of my substituents. The idea here is to make sure that my substituents have the smallest position number possible. So in this case, I notice that if I go ahead and proceed in a counterclockwise motion, I encountered a substituent first, right, I encounter a substituent faster going counterclockwise as opposed to going clockwise. So that means that I'm going to number my remaining carbons of the benzene ring in a counterclockwise direction. So now I can focus my attention on any substituents. And in this case, it just so happens that we have two, aside from the, all the hype, one of them is on carbon three of the benzene ring and the other is on carbon. For now, on carbon three of the benzene ring is a two carbon alkyl group, which if you recall is referred to as an EO group and on carbon four is an atom of chlorine. Now recall that when halogens are substituents in the context of AAC names, then the suffix I and E is dropped entirely and replaced with an O. So instead of saying Chlorine, I would refer to it as a coot substituent. So when I combined the name of the substituent with its position number, I get three dash Ethel or dash. Chloro. Notice how I using hyphens or dashes to separate numbers from letters. So at this point because I don't have any other substituents, our last step is to go ahead and put everything together. Substituents are listed in alphabetical order before the name of the parent chain. Now because the C in Chloro goes before the E in Ethel. My Chloral substituent gets written first. So that becomes four dash, Chloral dash three dash fo Benz aldehyde. Notice how I don't have spaces in between letters, but I do have hyphens to separate numbers from letters. So this gives me a final iupac name of four Chloro three Ethyl Benzal Hyde which matches with option A in the multiple choice and there you have it. So with that being said, thank you so very much for watching and I hope you found this helpful.

Write the IUPAC name for each of the following: (12.3)
a. <IMAGE>

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Key Concepts

IUPAC Nomenclature

Functional Groups

Structural Representation