Distinguishing among enantiomers requires a technique that has a chiral attribute.
(a) Boiling point does not distinguish among two enantiomers.
(b) Optical rotation does have a chiral aspect, and thus can distinguish between two enantiomers.
(c) Because hexane is an achiral solvent, enantiomers have identical solubilities in hexane.
(d) Density is not a chiral property, and thus the two enantiomers have identical densities.
(e) The solubilities of two enantiomers in principle vary in an enantiomerically pure chiral solvent.
(f) Dipole moment is not a chiral property, and thus the two enantiomers have identical dipole moments.
(g) Because taste buds are chiral, they in principle differentiate among two enantiomers.