What are the IUPAC names of the following alkanes?
a.

Question

What are the IUPAC names of the following alkanes?

a.

Accepted Answer

All right. Hi, everyone. So this question is asking us to give the Iupac name for the given arcane below. Option A says two methyl, four propane to ill hete. Option B says four isopropyl, two methyl heptane. Option C says two methyl, four isopropyl heptane. And option D says four isopropyl methyl heptane. So first, I'm going to scroll up one more time. So you can see the all cane a little bit better. Now, the first step if you recall is to always locate the parent chain of the compound and figure out how many carbons it happens to have, right. The parent chain refers to the longest continuous chain of carbon atoms present in the compound. If I consider the structure given on the screen here on the top, I have a three carbon chain that's continuous. Whereas beneath it, I have another seven carbon chain. Now because the seven carbon chain is longer, right? It's the longer continuous chain, this is going to be the parent chain and because the number of carbons is seven, the parent name is Hept. So thats the first step. Now the second step is to locate a name however many substituents are branching off of the parent chain. But before we address any specific substituents, I want to touch on really quickly how you go about numbering your carbon chain. Recall, recall that you should start numbering a parent chain from the end that is closest to a substituent. So once again, if I consider the structure that I'm given the right side of the structure is the one closest to a substituent, namely a meth. So to ensure that all substituents have the smallest position number possible, I would start numbering from right to left. And once again, that's important because the idea is to ensure that all substituents have the smallest position number you can give them. So now we can talk about substituents. Now, the first one that I see as I touched on just moments earlier was a methyl group consisting of one single carbon branching off of the parent chain. Now, according to the way that I've numbered my parent chain that methyl group is attached to carbon too. So I place the number two in front of the name of my substituent. And I add a dash in between them to separate numbers from letters that gives me a name of two metal. But I also have one more substituent now because the second substituent is three carbons long, it would be very easy to simply refer to it as a prop group. But we have to be a little bit more specific because this three carbon chain is attaching from or is attached to the parent chain from a specific position specifically in the middle. We would refer to this as an isopropyl group as opposed to simply a propal group. So the name of the substituent here is isopropyl and it is attached to carbon four of the parent chain. So that gives me four isopropyl. Now, in this case, in situations where you have multiple substituents of the same type, you would need a prefix before that specific substituents name to indicate their quantity like dye try tetra et cetera. But in this case, we don't have to do that right? Because there's only one of each substituent. So the third and final step is to put everything together. Now recall that substituents when you have more than one type are always listed in alphabetical order before the name of the parent chain. If you did need to use a prefix at some point, that prefix would not be considered when alphabetizing instead, you would focus on the name, right? So because the I in isopropyl goes before the M in methyl, I would place my isopropyl group first. So that's four dash isopropyl dash two dash methyl. Notice how once again I'm making a point to separate numbers from letters using dashes in between them. So now that all substituents have been named, all I have to do is place my parent name behind it with no space in between and thats Hept. So that gives me a complete Iupac name of four isopropyl, two methyl heptane, which means that my answer is going to be option B in the multiple choice. So with that being said, thank you so very much for watching. And I hope we found this helpful.

What are the IUPAC names of the following alkanes?
a.

Verified video answer for a similar problem:

Key Concepts

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What are the IUPAC names of the following alkanes?a.

Verified video answer for a similar problem:

Key Concepts

IUPAC Nomenclature

Alkanes

Structural Isomers

What are the IUPAC names of the following alkanes?
a.