What is the IUPAC name of the given compound?

1,5-Diaminopentane Pentane-1,5-diamine Pentan-1,5-diamine Pentamethylenediamine

Pentane-1,5-diamine

The parent carbon chain consists of five atoms with one amino group at each end, i.e., first and fifth carbon. The prefix di is used to indicate the two amino groups and the letter ‘e’ of the suffix part of pentane is retained. Hence, the name pentane-1,5-diamine.