Explanatory notes
… carbon and hydrogen which have at least one ring in their structure. They can be classified in three categories : (A) … etc. (b) Bridge-linked compounds such as 1,4,4a,5,6,7,8,8a-octahydro- exo -1,4- endo -5,8-dimethanonaphthalene (C 12 H … ), liquid. (c) Cyclohexene (C 6 H 10 ), liquid. (d) Cyclo-octatetraene (C 8 H 8 ), liquid. (e) Azulene (C 10 H 8 ), …