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Author Topic: Help finding all Isomers for C4H8..  (Read 10514 times)

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google1

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Help finding all Isomers for C4H8..
« on: October 17, 2010, 09:33:52 AM »

     I am looking for some clarification on isomers of C4H8?

I am studying for an exam and was just browsing quiz questions on the internet and found a question on sparknotes asking to draw as many isomers of C4H8 as possible. In the solution section they came up with 5 possible isomers.  I think I came up with an isomer that was not included in the solution section. I don't know the name so here is a description:  1 primary carbon-double bonded to-tertiary carbon. 

   

-----Also, how do you attach image files from ACD chem sketch? 
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majorjp

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Re: Help finding all Isomers for C4H8..
« Reply #1 on: October 17, 2010, 03:44:05 PM »

From your description I'm assuming it looks something like this:

If so that would be 2-methylpropene, more commonly know as Isobutylene
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google1

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Re: Help finding all Isomers for C4H8..
« Reply #2 on: October 17, 2010, 03:58:00 PM »

Yah, that is the molecule I was (trying) to describe.

2-methylpropene is not included as a isomer of the molecular formula  C4H8 on sparknotes.  Therefore, 'sparknotes' must be wrong right?
 
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majorjp

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Re: Help finding all Isomers for C4H8..
« Reply #3 on: October 17, 2010, 04:14:28 PM »

Yes it would be.
When considering the alkene isomers of C4H8 there are only 4 isomers, if one expands that to include cyclic alkanes there are 2 more (cyclobutane and methylcyclopropane).
I'm not exactly sure what 'sparknotes' lists though.
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google1

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Re: Help finding all Isomers for C4H8..
« Reply #4 on: October 17, 2010, 04:43:17 PM »

This is the webpage- http://www.sparknotes.com/chemistry/organic2/alkanes/problems.html#explanation1
 Click on solutions for problem 1 and the listed isomers will appear. 


So I guess it probably isn't worth all this trouble but when I am studying for an exam it is a little frusterating.
« Last Edit: October 17, 2010, 05:41:11 PM by google1 »
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majorjp

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Re: Help finding all Isomers for C4H8..
« Reply #5 on: October 17, 2010, 04:59:57 PM »

Yeah, it looks like that was the just the 1 out of the 6 possibilities they just left out for some reason
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