Final answer:
To produce 2-fluoropentane from pent-2-ene, Hydrogen fluoride (HF) is required. It reacts with the double bond to add a fluorine atom to the carbon chain, resulting in the desired product.
Step-by-step explanation:
To produce 2-fluoropentane from pent-2-ene, you would need a halogen that can add across the double bond of the alkene. The correct reactant for this transformation is Hydrogen fluoride (HF). Hydrogen fluoride will react with the double bond of pent-2-ene in a hydrohalogenation reaction, adding a fluorine atom to one carbon of the double bond and a hydrogen atom to the other carbon, resulting in the halogenated alkane 2-fluoropentane.