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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: pixie on October 10, 2005, 05:53:38 PM

Title: chloroarenes have lower boiing points than bromoarenes
Post by: pixie on October 10, 2005, 05:53:38 PM

Can anyone help explain why chloroarenes have lower boiing points than bromoarenes which have lower boiling points than iodoarenes?

Title: Re:aryl halides
Post by: movies on October 10, 2005, 07:58:32 PM

Think about the chemical properties that affect boiling point.  How are these different in the three molecules you mentioned?

Title: Re:aryl halides
Post by: pixie on October 11, 2005, 12:54:50 PM

Is it the mass of bromine and iodine being heavier?

Title: Re:aryl halides
Post by: Garneck on October 11, 2005, 02:52:04 PM

bingo..

Title: Re:aryl halides
Post by: movies on October 11, 2005, 03:49:14 PM

Yep.  You could also think about the polarizability of Cl vs. Br vs. I.  It is the same argument you would make with dispersion forces of alkanes.