Organic Chemistry

Learn the toughest concepts covered in Organic Chemistry with step-by-step video tutorials and practice problems by world-class tutors.

4. Alkanes and Cycloalkanes

Cis vs Trans Conformations

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Before we can really understand chair conformations, we have to practice drawing them! These tricky little suckers can be hard to get right.  

Method for Drawing Chairs

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concept

How to draw chairs.

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  1. Draw two slightly angled parallel lines. 
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  1. Cap both ends off
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How did you do?

 

It's ok if you didn't draw it beautifully the first time - practice makes perfect!

Cis and Trans

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concept

How to distinguish cis from trans.

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Cis or trans is based on whether the groups are facing the same face (top or bottom) of the ring.

  • It has nothing to do with the axial and equatorial positions!
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example

Is the following cyclohexane cis or trans?

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4

example

Is the following cyclohexane cis or trans?

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Not too bad, right? It's as easy as it sounds! Let's move on.