trans-1,4-dimethylcyclohexane

The cyclohexane ring is the parent chain; either methyl-bearing carbon could be carbon #1.

2-chloro-5-methyloctane

The octane chain is the parent; the lowest number sequence is generated when the chlorine is bonded to carbon #2.

5-ethyl-1,1,3-trimethyl-2-
(2-methylpentyl)cyclohexane

The cyclohexane ring is the parent; the lowest number sequence is generated when the geminal dimethyl group is bonded to carbon #1, proceeding counter-clockwise around the ring.

Alkane Nomenclature

For each of the compounds on the left, give the IUPAC name; pay particular attention to stereochemistry.

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click on the button to view the parent chain and the correct numbering sequence.