Hexane is an organic compound (hydrocarbon) made of the elements carbon and hydrogen. Hexane is an unbranched isomer (n-hexane). A compound that exists in forms having different arrangements of atoms but the same molecular weight is known as isomer.exane’s physical properties are eminent. 1  The molecular formula of hexane is C6H14. 2  It is mostly a colorless liquid. 3  It has a melting point of roughly -139.54°F (-95.3°C) and. 4  The boiling point is 154.04°F (67.8°C).