Based on your knowledge of intermolecular forces, which of the following would you expect to have the highest boiling point? hexanal hexane hexanone hexanol

            Hexanol has the highest boiling point.

Explanation:
                   Boiling points of all give compounds are as follow,

                   Hexanol      =   157 °C

                   Hexanal      =   129 °C

                   Hexanone   =   128 °C

                   Hexane       =    68 °C

Types of Interactions found in these compounds are,

                 Hexanol      =   Hydrogen Bonding & London Dispersion Forces

                 Hexanal      =   Dipole-Dipole Interactions & London Dispersion                                                              Forces

                 Hexanone   =   Dipole-Dipole Interactions & London Dispersion                                                            Forces

                 Hexane       =    Only London Dispersion Forces

Strength of Intermolecular Forces:
                                                      Hydrogen forces are stronger than Dipole-Dipole Interactions, and Dipole-Dipole Interactions are stronger than London Dispersion Forces.

Result:
           Hence, due to presence of strong Hydrogen Bond Interactions Hexanol has the highest Boiling Point.

D)can be increased in a closed system

Answer) by studying proton collisions hope this : )