The strength of intermolecular attractions can be approximately
ranked by the following: hydrogen bonding > dipole-dipole
interactions > induced dipole-induced dipole interactions.
Linear alkanes will have greater induced dipole-induced dipole
interactions than branched alkanes, due to the more spherical shape
of a branched alkane.
Hexane does not have important charge attraction while
1-chlorohaxane had dipole-dipole interaction as well as induced
dipole-induced dipole interaction, because of the - Cl and slightly
+ H