The IUPAC nomenclature system is a set of logical rules devised and used by organic chemists to circumvent problems caused by arbitrary nomenclature.
The 1-ethyl-3-propylcyclopentane molecule contains a total of 30 bond(s) There are 10 non-H bond(s), 3 rotatable bond(s) and 1 five-membered ring(s).
The 1,2-dimethylcyclopentene molecule contains two methyl groups and one double bond in the ring.
The 1,3,5-Triethylbenzene molecule contains three ethyl groups and a benzene ring.
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