Both have bridged chloride structure in vapour phase, soluble in oragnic solvents and are strong lewis acids
They are used as friedel craft catalysts
In Solid state, BeCl2 has a ploymeric chain structure. The structure is formed because of electron deficient nature of BeCl2 . The Be atom is surrounded by four Cl atoms in tetrahedral shape, two bounded by covalent bonds and two other by coordinate bonds.