Trans and Cis

Moderators: Chem_Mod, Chem_Admin

Leslie Almaraz 4G
Posts: 99
Joined: Fri Aug 02, 2019 12:16 am

Trans and Cis

Postby Leslie Almaraz 4G » Sun Nov 24, 2019 5:59 pm

Is the only way to determine is a compound is trans- or cis- by the formation of the atoms?

rabiasumar2E
Posts: 108
Joined: Thu Jul 11, 2019 12:15 am

Re: Trans and Cis

Postby rabiasumar2E » Sun Nov 24, 2019 6:01 pm

Yes, so if two of the same atoms are on the same side of the central atom then it is cis- and if they are on opposite sides then it is trans-.

Ruby Tang 2J
Posts: 102
Joined: Fri Aug 30, 2019 12:15 am

Re: Trans and Cis

Postby Ruby Tang 2J » Sun Nov 24, 2019 6:05 pm

Yes, you wouldn't be able to tell if you were just given the molecular formula. Cis-trans isomerism is when there is a double bond and therefore restricted rotation, since pi bonds can't be rotated without being broken. Cis indicates that the functional groups appear on the same side of the double bond, whereas trans indicates that they appear on opposite sides.

Arianna Perea 3H
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

Re: Trans and Cis

Postby Arianna Perea 3H » Sun Nov 24, 2019 6:58 pm

is it still a cis if more than 2 atoms are on the same side?

Areena H 2K
Posts: 81
Joined: Wed Dec 05, 2018 12:18 am

Re: Trans and Cis

Postby Areena H 2K » Sun Nov 24, 2019 9:52 pm

Cis would be when the 2 atoms bond are on the same side and trans is when they are on opposite sides

JohannaPerezH2F
Posts: 94
Joined: Wed Sep 18, 2019 12:18 am

Re: Trans and Cis

Postby JohannaPerezH2F » Sun Nov 24, 2019 10:05 pm

yes, and it would by looking at where the isomer is. the isomer where the two methyl groups are on the same side of the double bond is called “cis”, and the isomer where the two methyl groups are on the opposite side is called “trans”.

Jasmine Summers 4G
Posts: 50
Joined: Wed Sep 18, 2019 12:17 am

Re: Trans and Cis

Postby Jasmine Summers 4G » Sun Nov 24, 2019 10:17 pm

From what I understand, trans and cis are just 2 versions of resonance structures. Trans and typically non polar, while cis are polar.

Jennifer Yang 3F
Posts: 56
Joined: Wed Sep 11, 2019 12:17 am

Re: Trans and Cis

Postby Jennifer Yang 3F » Sun Nov 24, 2019 10:30 pm

Yes, if the two identical atoms are on the opposite side, it's trans. If two identical atoms are not the same side, it's cis.

504939134
Posts: 103
Joined: Wed Sep 18, 2019 12:21 am

Re: Trans and Cis

Postby 504939134 » Sun Nov 24, 2019 10:49 pm

Yes, whenever you see that there are the same two molecules on the same side you will know it is cis, and if you see them on opposite sides it is trans.


Return to “Naming”

Who is online

Users browsing this forum: No registered users and 2 guests