Question

1- bromo pent-3-ene
Or 5- bromo pent -2-ene
Right

Answer 1

5-Bromo-pent-2-ene

References:

1. PubChem [Electronic resource] : U.S. National Library of Medicine, National Center for Biotechnology Information. – Mode of access: https://pubchem.ncbi.nlm.nih.gov/compound/11073580. – Date of access: 08.04.2019.