Draw the line-angle formula for each of the following:
a. 3-methylheptane

Question

Draw the line-angle formula for each of the following:

a. 3-methylheptane

Accepted Answer

Welcome back everybody. Our next question says, what is the line angle formula of four ethyl nana. So although we can see from our answer choices, we need to recall that line angle formula is the same thing as a skeletal formula. So that format where we draw, we don't draw any atoms out except for ones that are not carbon or hydrogen carbon is indicated by a corner or an angle. As we draw a line, the bonds are indicated by lines and hydrogens are not written in but assumed based on what we know of how many hydrogens each carbon would take. So again, we don't really have to remember that because we have a multiple choice format here. So we see the kinds of structures that are presented to us though, you might have to recall that if you had options of different types of structures. So let's look at the name of our compound to see what we need to have. Well, we have this prefix non. So we have nine carbon atoms here in our main chain and then we have the prefix for ethyl. So we have an ethyl group which as we can recall is CH two CH three. So it's a two Carmen branch on carbon number four. So let's start by looking at our answer choices and counting how many carbons we have in the main chain. And before we even do that, just by glancing at this, we can see there are only two choices that have an ethyl group or you see the two carbons, when you look at choice C, it has two methyl groups, two single carbon chains as does Choice D. So the chain is depicted wrongly, there's two carbons, but on two separate chains. So it would be two different methyl groups rather than a single ethyl substituent. So choice C and Choice D are definitely incorrect. So let's count the carbons in our main chain on our remaining choices. So for choice A, we'll count every corner including the end, of course. So let's go ahead and use a blue highlight as we do that. 123456789. So we have a nine carbon main chain with an ethyl branch, double check that that's on carbon number four. So 1234. So it's in the correct location. It's the correct kind of branch and our chain is the right number of carbons. So choice A is correct to be thorough. We'll just double check. Choice B. So we have our Ethel branch. We have 12345. But here I am at carbon five and my branch is on carbon five 6789. So we do have the correct number of carbons, but the ethyl branch is on carbon five. So branch on the wrong carbon. Now, you do need to be careful because sometimes if your molecule is symmetrical, that might mean that the carbon could be numbered two different ways. So let's just double check that you don't have the carbon five being carbon four from another direction. But of course, since we have nine carbons, carbon five is right in the middle. So there's no way that can have a different number in this case. So choice B is not a correct answer. So once again, the correct line angle formula for four ethyl nana is choice A with a nine carbon chain and a two carbon ethyl branch on carbon four. See you in the next video.

Draw the line-angle formula for each of the following:
a. 3-methylheptane

Verified video answer for a similar problem:

Key Concepts

Line-Angle Formula

Alkanes

IUPAC Nomenclature

Draw the line-angle formula for each of the following:a. 3-methylheptane

Verified video answer for a similar problem:

Key Concepts

Line-Angle Formula

Alkanes

IUPAC Nomenclature

Draw the line-angle formula for each of the following:
a. 3-methylheptane