What is the common name of 3-Bromopropene?

Tert-Butyl bromide Vinyl bromide  Allyl bromide Propylidene bromide

Allyl bromide

3-Bromopropene has 3 C atoms in the parent chain with a double bond at C-1 and Br at C-3. This means that Br is attached to the C which is next to the C-C double bond, hence it is an allylic halide.