Question
Wed January 26, 2011 By: Arun Iyer

How will iso butane have weak intermolecular forces and how it has an higher boiling point than n butane if n butane's intermolecular forces are stronger than that of iso butane?

Expert Reply
Thu January 27, 2011
Dear Student
 
I think there is a small confusion. 
 
Butane has a higher boiling point because the dispersion forces are greater. The molecules are longer (and so set up bigger temporary dipoles) and can lie closer together than the shorter, fatter 2-methylpropane molecules.
 
We hope that clarifies your query.
Regards
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