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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: no username inserted on January 29, 2013, 10:29:52 AM

Title: Boiling point of cis-trans isomers!
Post by: no username inserted on January 29, 2013, 10:29:52 AM

Which one do you think has a higher boiling point? trans or cis -1,2-cyclopentanediol? explain your reason please.

Title: Re: Boiling point of cis-trans isomers!
Post by: discodermolide on January 29, 2013, 11:01:46 AM

Which do you think has the higher BPt. and you explain the reason first. (Forum policy)

Title: Re: Boiling point of cis-trans isomers!
Post by: no username inserted on January 30, 2013, 04:54:44 AM

So I suppose , trans has the higher boiling point. Since there might be some internal hydrogen bonding in the cis isomer. Am I right?

Title: Re: Boiling point of cis-trans isomers!
Post by: discodermolide on January 30, 2013, 05:35:43 AM

No, in general the cis isomer has the higher BPt. See
http://www.chemguide.co.uk/basicorg/isomerism/geometric.html (http://www.chemguide.co.uk/basicorg/isomerism/geometric.html)

Title: Re: Boiling point of cis-trans isomers!
Post by: Babcock_Hall on January 30, 2013, 10:03:09 AM

Quote from: no username inserted on January 30, 2013, 04:54:44 AM

So I suppose , trans has the higher boiling point. Since there might be some internal hydrogen bonding in the cis isomer. Am I right?

I do not see why internal hydrogen bonding would have much of an effect.  What about intermolecular forces?