Question

Give IUPAC names for the following compounds.

(a)

(b)

(c)

Short answer

(a)3-ethyl-1,1-dimethyl cyclopentane

(b)3-cyclopropyl-1,1-dimethylcyclohexane

(c)nonan-4-ylcyclobutane

Step-by-step solution

IUPAC nomenclature of cycloalkane

Substituted cycloalkanes use the cycloalkane for the base name, with the alkyl groups named as substituents. If there is one substituent, no numbering is needed.

If there are two or more substituents on the ring, the ring carbons are numbered to give the lowest possible numbers for the substituted carbons. The numbering begins with one of the substituted ring carbons and continues in the direction that gives the lowest possible numbers to the other substituents.

(a)

The longest carbon ring is of 5 carbon. One ethyl group is branched at C3 and two methyl groups are branched at C1 position.

(b)

Cyclohexane ring consist of cyclic propyl ring at C3 and two methyl groups branched at C1 position.

(c)

Nine carbon chain with cyclic butyl group at C4 position, replacing one hydrogen from the site.