4. Alkanes and Cycloalkanes
Cis vs Trans Conformations
4. Alkanes and Cycloalkanes
Cis vs Trans Conformations - Video Tutorials & Practice Problems
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Get a 10 bullets summary of the topicBefore 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
1
concept
How to draw chairs.
Video duration:
1mPlay a video:
Video transcript
- Draw two slightly angled parallel lines.
![Content](https://cdn.clutchprep.com/guide_visuals/inline_images/QSLkXoT5Oa3GNAx11Pbw_55.png)
- Cap both ends off
![Content](https://cdn.clutchprep.com/guide_visuals/inline_images/K0yPubcNQjK5pWbDu6KA_56.png)
How did you do?
It's ok if you didn't draw it beautifully the first time - practice makes perfect!
Cis and Trans
2
concept
How to distinguish cis from trans.
Video duration:
39sPlay a video:
Video transcript
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!
3
example
Is the following cyclohexane cis or trans?
Video duration:
44sPlay a video:
Video transcript
![Content](https://cdn.clutchprep.com/guide_visuals/inline_images/pKnnOm1HRMeBKaG7BC0N_57.png)
4
example
Is the following cyclohexane cis or trans?
Video duration:
27sPlay a video:
Video transcript
![Content](https://cdn.clutchprep.com/guide_visuals/inline_images/x8pdhCLSMfqzOzDev25A_58.png)
Not too bad, right? It's as easy as it sounds! Let's move on.
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Additional resources for Cis vs Trans Conformations
PRACTICE PROBLEMS AND ACTIVITIES (11)
- Name the following compounds. Remember that two up bonds are cis; two down bonds are cis; one up bond and one ...
- Given the following chair conformations, draw each in its planar form as if you were viewing it from above. (...
- Given the following chair conformations, draw each in its planar form as if you were viewing it from above. (...
- Is each of the following a cis isomer or a trans isomer? a. b. c.
- Given the following chair conformations, draw each in its planar form as if you were viewing it from above. (...
- Name the following compounds. Remember that two up bonds are cis; two down bonds are cis; one up bond and one ...
- Use your results from [PROBLEM 3-27] to complete the following table . Each entry shows the positions of two g...
- The cyclohexane chair shown in [FIGURE 3-22] <IMAGE> has the headrest to the right and the footrest to t...
- Draw two different chair conformations for each of the following molecules. Make sure that your drawings clear...
- Which of the following represents a cis isomer?<IMAGE>
- Name the following cycloalkanes using the IUPAC system of nomenclature.<IMAGE>