Video Solution: Give the IUPAC name for each of the following compounds: ...

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Give the IUPAC name for each of the following compounds:

 

Video Transcript

Hey everyone. So, here they gave us this bond line structure and it's our job to give the IUPAC name for it, so the first thing that we need to do is what do you think? we need to figure out what carbons there are substituents and how we actually name the longest parent chain, right? So notice that we could start in many different ways but what you'll notice is that we actually have this group here and this group here that are the same, what I mean by that is if we started numbering here as 1,2 it would be the same as numbering here 1,2 because we get to three at the same position. So, at three we could have a substituent but let's see if we can do one better and get a substituent at two. we have to give our substituents the lower numbers, let's say we're starting over to the right and give either of this 1. So one, we'll take a look at two now we actually get a substituent, we actually get two substituents, right? So the blue route would be a lot better than the red route because we actually get our substituents at a lower number, so let's continue. here we get the four adds a substituent and again it doesn't matter which one we get five and 6, let's just go to the bottom and give this five and six and actually cross out everything because now we actually have all of our carbons numbered, right? And now we need to figure out what our substituents are we have a six carbon chain which represents hexane, right? Because there's no double bonds or triple bonds and then that part of the four we have an ethyl group, right? Because it's a CH2, CH3 as part of to do we have a methyl, how do we have any called it in our IUPAC name, we have a CH3 here, a CH3 here, so we actually have to indicate that we have two substituents that are the same by doing 2,2 and then what we're going to call this is dimethyl, okay? So I hope you guys saw how we did that, so it's 2,2-dimethyl 4 ethyl hexane but now we actually have to combine all this and what's the most important thing to remember when you combine your systematic or your IUPAC name, alphabetical order, okay? So we know hexane is going to be at the end but now which one is going to come first ethyl or methyl? And I know some of you might have some trouble with this but just remember when you have di or tri, that doesn't count, right? So we're going to put that interesting like that we're not looking at that for abc order. What we are looking though is an e for apple and an m for methyl and you'll recognize that e will come before m, so we want to start out with 4 even though we have that lower number for our dimethyl, so it's going to be 4-ethyl, it's going to be another dash 2,2 dimethyl and I'm hoping you guys are going to be able to see this, I'm going to move it over to the bottom of our screen and continue with the name, so we have dimethyl, the l didn't really carryover so let's just erase it and then we don't have any more dashes, we just include that route. So, hexane for 6 carbons, okay? So this is actually that longest chain that we identified, we have our two substituents, one was these methyl groups right here that we we labeled at 2,2 dimethyl and the other one was an ethyl group at position 4 that we labeled as well, so the complete IUPAC name for this bond line structure was 4-ethyl 2,2-dimethyl hexane. Alright, so I hope that makes sense, let me know if you have any questions everyone.

What is the IUPAC name of the following molecule?

A)        4-secbutyl-4,8-dimethyldecane

B)        3,4,8-trimethyl-4-propyldecane

C)        3,7,8-trimethyl-7-propyldecane

D)        4,8-dimethyl-4(1-methylethyl)-decane

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Each of the following names are incorrect. Provide the correct name and structure.

2-ethylhexane

 

 

2-methyl-3-ethyl-octane

 

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Provide an acceptable IUPAC name for the following three molecules. Do not designate R or S for this but you need to indicate cis or trans if appropriate.

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What is the correct name of the alkane shown?

A. 3,6-diethyl-2,2,5-trimethylheptane

B. 3-ethyl-2,2,5,6-tetramethyloctane

C. 3-tert-butyl-5,6-dimethyloctane

D. 5,6-dimethyl-3-tert-butyloctane

E. None of the above

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Draw the structure described by this name:  5-Neopentyloctane

 

Which statement below is  TRUE?

A. The name  5-neopentyloctane is CORRECT

B. The correct name of this molecule is  4-neopentyloctane

C. The correct name of this molecule is  2,2-dimethyl-4-butylheptane

D. The correct name of this molecule is  2,2-dimethyl-4-propyloctane

E. No statement above is true.

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Draw the structure described by this name:  2-Ethyl-3-methylpentane 

 

Which statement below is  TRUE?

A. The name  2-ethyl-3-methylpentane  is CORRECT

B. The correct name of this molecule is  3,4-dimethylhexane

C. The correct name of this molecule is  4-ethyl-3-methylpentane

D. The correct name of this molecule is  2,4-dimethylhexane

E. No statement above is true

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Draw a line–angle structure for 4,5–dipropyloctane.

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Draw a line–angle structure for 3–Ethyl–4–methylhexane.

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Write the IUPAC name for the following strucutre. Ignore R and S while naming.

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What is a correct IUPAC name for this compound?

A) 1,1,1,6-tetramethylheptane

B) 1-tert-butyl-4-isopropylbutane

C) 2,2,7-trimethyloctane

D) 1-tert-butyl-4-isopropyloctane

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