Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes?
a. identify the longest chain of carbon atoms.
b. examine the multiple bond for cis- and trans- isomers.
c. number the chain of carbons, starting with the end nearest the multiple bond.
d. add a number prefix indicating the first carbon atom in the multiple bond.

"c. Number the chain of carbons, starting with the end nearest the multiple bond."

This choice means that the carbon atoms determine the name of the hydrocarbonsThank you for your question. Please don't hesitate to ask in your queries. 

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