Molar refraction rm is an additive property, sometimes it is regarded as a sum of the increments of chemical bonds, e. g.: c-c 1.21 cm mot! , cc 4.15 cm mot! , c-h 1.7 cm moth, etc. liquid hydrocarbon c6h12 has den- sity = 778.4 kg m and its refractivity index n=1.4260. using the molar refraction, decide if it is hexene or cyclohexane. a) rm = 27.70 cm moll, hexene b) rm - 29.39 cm mot hexene c) rm = 27.66 cm3 mol-1 cyclohexane d) rm = 29.39 cm3 mol-1.cyclohexane