Final 2012 Question 5

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KaylaH
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Final 2012 Question 5

Postby KaylaH » Wed Mar 09, 2016 9:28 pm

Why is molecule B a cis molecule?

Chloe 3D
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

Re: Final 2012 Question 5

Postby Chloe 3D » Wed Mar 09, 2016 10:34 pm

If I'm having trouble deciding between cis and trans from a line structure, it always helps me to draw the Lewis Structure of the compound (or at least the portion surrounding the double bond).

In this case, on either side of the C=C bond, each carbon atom is bonded to both an additional carbon atom (as depicted in the line diagram) and a hydrogen atom (not shown). Because the C atom has higher priority than the H atom, and the two C atoms are on the same side of the double bond, it is the cis conformation.

ShangShi1K
Posts: 17
Joined: Fri Sep 25, 2015 3:00 am

Re: Final 2012 Question 5

Postby ShangShi1K » Thu Mar 10, 2016 8:17 pm

Do this mean that we need to write cis or trans for all cycloalkenes? In this case there's only a ketone attached to the ring. Is the cis here determined by the ketone or it's just because the two carbons connected to the double bond have higher priority than H??


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