General chemistry

[iphone2020]

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Hello EVERYONE,
When it comes to CIS and Trans and their stabilizes, and BP and Melting can some one please tell me their relationship?

Thanks


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[DAT Destroyer]

Hello EVERYONE,
When it comes to CIS and Trans and their stabilizes, and BP and Melting can some one please tell me their relationship?

Thanks


Sent from my iPhone using SDN mobile

Lets examine trans 1,2- dibromo ethene and cis 1,2 -dibromo ethene.
In case of trans, dipoles cancel out, so the molecule is non-polar, thus only relies in dispersion forces for intermolecular interactions. This will result in a lower boiling point.
However, cis 1,2- dibromoethene has a dipole, therefore molecules will use dipole-dipole forces for the intermolecular interactions. This will result in higher boiling point.

Hope this helps.

 

[iphone2020]

Thank u so much !!!! They made everything clear


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[DAT Destroyer]

Thank u so much !!!! They made everything clear


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🙂

 

[iphone2020]

Trans are more stable than CIS correct!


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[DAT Destroyer]

Trans are more stable than CIS correct!


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Generally speaking the TRANS isomer is more stable than the CIS. HOWEVER,,,,,,this is just a rule of thumb and not necessarily always true. For example, consider 1,3-cyclohexanediol. When put in the chair conformation, we see an intramolecular hydrogen bond that adds stabilization when both groups are cis and axially placed !! If you are dealing with species such as alkenes or nitrogen compounds with double bonds, TRANS has less steric hinderance and would be the most stable. I hope this helps. Your question was very broad and could not warrant a simple yes or no response. Regards.....Dr Jim Romano.

 

[iphone2020]

Thanks you so much!!! I understand! Sorry for asking because I was reading the bootcamp explanation and it kind got me confuse! That's reason why I ask that question! But now it is clear! Thanks


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[DAT Destroyer]

Thanks you so much!!! I understand! Sorry for asking because I was reading the bootcamp explanation and it kind got me confuse! That's reason why I ask that question! But now it is clear! Thanks


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Glad I could clear that up for you.

 

[iphone2020]

[emoji106]


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