The key difference between allylic and vinylic carbon is that allylic carbon is the carbon atom adjacent to the double-bonded carbon atom, whereas the vinylic carbon atom is one of the two atoms that share the double bond.

Haloarene or aryl halide is a chemical compound containing arenas, where one or more hydrogen atoms are bonded to the aromatic ring and are replaced with halogens.

Vinyl carbon is ${\mathrm{sp}}^2$ hybridized aliphatic carbon