September 23, 2020, 05:43:45 AM
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Topic: Problems with alkanes and alkenes  (Read 10418 times)

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lira

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Re: Problems with alkanes and alkenes
« Reply #15 on: October 20, 2009, 03:30:20 PM »
Sorry I wrote it wrong (english is not my first language) I ment that on this picture are four more diffrent isomers that I have to identify and then say which are more stable and I  know that on this picture are isomers of 1,2,4-trimethylcyclohexane but I don't know which are cis and which are trans

Offline KritikalMass

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Re: Problems with alkanes and alkenes
« Reply #16 on: October 20, 2009, 04:22:07 PM »
Do you know what the dashes and the wedges indicate? The dashes indicate that something, in this case a methyl group, is going into the plane. A wedge indicates that something is coming out of the plane. If you have a model set I suggest you make a model- it will become immediately clear which ones are trans and which ones are cis because in cis all the methyl groups will be on one side (the drawing will either have all dashes or all wedges) and in trans at least one of them will be on the other side (so you will have wedges mixed with dashes).

But yeah- if you don't have a model set get one! A model set makes problems like this easy  ;)

Good luck!

lira

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Re: Problems with alkanes and alkenes
« Reply #17 on: October 21, 2009, 10:45:12 AM »
I didn't know that. Thanks I will try to do that like you said.

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