The IUPAC name of the given compound is
The given compound is an unsaturated hydrocarbon belonging to the alkene group. While naming hydrocarbons containing double bonds, numbering should be done in such a way that the carbon atom linked with a double bond gets the lowest number.
The naming convention should be word root + Position of the triple bond + suffix 'ene'. The IUPAC name of the given compound is Pent- 2- ene.