# Why does acetone have a lower boiling point than hexane?

Why does acetone have a lower boiling point than hexane? I thought that since hexane is non-polar then it should have weaker intermolecular forces and a lower boiling point, but it doesn't. Why?

For reference, the boiling point of acetone is roughly 56 °C while that of n-hexane is roughly 68 °C.

• Asphalt and parafin wax are just made of nonpolar molecules, too... – Zhe Feb 24 '18 at 3:12
• Why a comparison between acetone and hexane? Why not between 2- or 3-pentanone (bp 101-102 $\ce{^{o}C}$, MW 86) and hexane (MW 86)? – user55119 Mar 26 '18 at 14:53
• The real surprise is that the smaller molecule acetone has nearly the same boiling point as hexane. – matt_black Mar 27 '18 at 14:49