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

Question

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

b.

Accepted Answer

All right. Hi, everyone. So this question is asking us which of these is the Iupac name of the structure below. Option A says Bromine chlorine prophyl aldehyde. Option B says three chloro 23 dibromm proin aldehyde. Option C says 23 Dipro di bromo, excuse me, three CHOPR now and option D says two bromo three chop propal Hyde. So in this case, what I want to bring your attention to first is the fact that in the structure provided is a car bono or carbon double bonded to oxygen with a hydrogen attached to the carbon carbon. This indicates that the primary functional group present in this compound is an aldehyde. So the first step when it comes to any Iupac name is to name the parent chain present in the compound. Now, the parent chain is the longest continuous chain of carbons in the molecule that also incorporates the aldehyde. So starting off by numbering the carbon carbon. Number one, I can see that there are a total of three carbons in this molecule. Now, that would give me a parent name of propane, but recall that sometimes modifiers are used to specify what functional groups are present. All the hides are no exception because we have an aldehyde. In this case, the e at the very end of propane gets dropped entirely and replaced with A L. So instead of propane, I would say propel. And so at this point, I would go ahead and focus my attention on the second step which involves identifying and labeling other substituents present in the compound. Now, aside from the aldehyde functional group itself, I can see that I have a total of three other substituents present in the molecule. I have two atoms of bromine and one atom of chlorine. Recall it when halogens are treated as substituents, the suffix I and E gets dropped entirely and replaced with an O. So instead of saying bromine and chlorine, thats bromo and Chloro. However, recall that additional information is going to be necessary for this Iupac name, one of which is the position number of every substituent present in the molecule. So in this case, we have two atoms of bromine, for example, one on carbon two and the other on carbon three of the parent chain. So before the name of the substituent should go the position number. And because I have two position numbers or the same substituent, I would use a comma to separate those from each other. Whereas for chlorine, I only have one on carbon three. So that would just be three dash coral because recall that hyphens are used to separate numbers from letters. However, the case of bromine is not as straightforward because there are multiple copies of the same substituent in the same molecule. A prefix is necessary to specify how many there are in this case because there are two atoms of bromine present, the appropriate prefix would be die. So that's two comma three dash di bromo comma separate numbers and dashes separate numbers from letters. So at this point, my last step is to go ahead and put everything together. Substituents are listed in alphabetical order before the name of the parent chain and recall that prefixes do not count for the alphabetical order. So here the be in bromo goes before the sea in coral. So that's 2 3 dash oops Dior or Di Bromo dash three dash C followed by the parent chain which is propel notice how there are no spaces in between letters. And so when all is said and done, the iupac name here is 23 Di Bromo three Chloral Pronel which matches option C 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)
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Key Concepts

IUPAC Nomenclature

Functional Groups

Structural Representation