Draw and name all constitutional isomers

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The discussion revolves around solving a homework problem in Organic Chemistry that involves identifying constitutional isomers of the molecular formula C9H20. The task requires finding isomers that contain one quaternary carbon and one or more ethyl groups, with a total of three isomers to be identified. Participants suggest starting with one ethyl group and determining its placement on the main carbon chain to maintain its classification as ethyl. Emphasis is placed on drawing one isomer first to simplify the process of finding additional isomers. The formula C9H20 is confirmed to represent an alkane. The conversation highlights the importance of structural drawing and systematic exploration in organic chemistry to identify isomers.
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I am doing my Organic Chem homework and need help. It asks: Draw and name all constitutional isomers with formula C9H20 which have one quaternary carbon and one or more ethyl groups (there are three). What are they and how do I find them?
 
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Is C9H20 an alkane, alkene or alkyne ? Start with one ethyl group and figure out where you can stick this group on the main chain for it to still be called ethyl. Now fix the main chain by making sure it has a quaternary C.

Start off and draw one isomer, and then you'll find it easier to get more.
 
Gokul43201 : Thanks for the help! :)
 

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