Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes?

Alkenes can show cis–trans isomerism when each carbon in the C=C double bond is attached to two different groups, so their names may need to specify cis or trans. Alkynes have a linear C≡C triple bond and do not show cis–trans isomerism. Therefore, examining the multiple bond for cis- and trans-isomers is the step used for alkenes but not alkynes.

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