What is the IUPAC name for 2-pentyne?

The IUPAC name for 2-pentyne is indeed "pent-2-yne." This name accurately reflects the structure of the compound. In IUPAC nomenclature for alkynes, the "-yne" suffix indicates the presence of a triple bond. The number in the name indicates the position of the triple bond within the carbon chain.

In the case of 2-pentyne, the compound has a five-carbon chain (hence "pentyne") with the triple bond starting at the second carbon, which is denoted by "2." The alternative format, "pent-2-yne," is another accepted way to express the same compound, as it follows the same principle of indicating the position of the triple bond.

Therefore, option C accurately represents the correct structural information according to IUPAC naming conventions.