Atmospheric pressure decreases as altitude increases. in other words, there is more air pushing down on you at sea level, and there is less air pressure pushing down on you when you are on a mountain. if hexane (c6h14), octane (c8h18), and octanol (c8h17oh) are heated evenly at different altitudes, rank them according to the order in which you would expect them to begin boiling. rank from first to last. to rank items as equivalent, overlap them. view available hint(s) octane at high altitudeoctane at sea levelhexane at high altitudeoctanol at sea level

Boiling point is the temperature at which vapour pressure equals atmospheric pressure.

As, we move at higher altitudes, atmospheric pressure decreases. Hence, temperature to reach the boiling point will decrease.

Further, boiling point is higher for longer chain compounds. Hence, octane (C8H18) and octanol (C8H17OH) will have higher boiling point as compared to hexane (C6H14). Further, intermolecular forces of interaction are more stronger in octanol, due to presence of OH group, as compared to octane.

Hence, boiling points will be in following order: 
                                              Octanol > Octane > Hexane

Thus, hexane will boil first, followed by octane and lastly octanol.