Physically, allyl bromide is a colorless liquid with an irritating and persistent smell, however, commercial samples are yellow or brown. Allyl bromide is more reactive but more expensive than allyl chloride, and these considerations guide its use.
Allyl bromide is a colorless liquid that has a pungent smell. However, commercially available samples often appear yellow or brown. Due to its higher reactivity compared to allyl chloride, but at a greater cost, it's used in specific applications.