What is the IUPAC name for a hydrocarbon consisting of a 10 carbon straight chain with a double bond at carbon 5?

The correct name for a hydrocarbon that consists of a straight chain of 10 carbon atoms with a double bond located specifically at carbon 5 is 5-Decene. In IUPAC nomenclature, the "Dec-" prefix indicates the presence of ten carbon atoms, and the suffix "ene" signifies that there is at least one double bond within the molecular structure. The number "5" indicates the position of the double bond, ensuring it is clear where the unsaturation occurs in the molecule.

Choosing this name properly reflects the structure of the hydrocarbon as it follows the IUPAC naming conventions, which prioritize indicating the location of the double bond in alkenes. The other options do not accurately describe the structure given in the question. For example, "5-Decyne" refers to a triple bond, which is not present in this case. "Decane" implies a saturated hydrocarbon with no double bonds. Similarly, "6-Decene" inaccurately places the double bond at carbon 6, which does not align with the information provided in the question.