Both hexane and `CF_(4)` have the same molecular mass and are non-polar, yet the boiling point of hexane (341 K) is greater than `CF_(4)` (144 K). Why ?

Explanation

Hexane is a straight-chain alkane (or underanched), so it is less compact or has more surface area and hence has higher boiling point than `CF_(4)`. Whereas, `CF_(4)` is spherical and has less approachable area for intermolecular attractive force and has lower boiling point.