What is the difference between hexanes and cyclohexanes?
Hexanes are aliphatic, a straight (or branched) chain; cyclohexane is alicyclic, it features a carbocyclic ring.
The general formula of hexanes is
Of course the extra
It goes without saying (does it? then why am I saying it!) that these are different molecules, with different chemical and physical properties. The melting point of cyclohexanes is unusually high, presumably because the rings can pack together in the solid state effectively.