Comment on the structure of beryllium chloride 

Explanation

Beryllium chloride has a chain structure in the solid state due to the formation of coordinate bond between Cl and Be of different molecules. Hybridisation of Be in it is sp. In vapour phase `BeCl_(2)` tends to form a chloro-bridged dimer in which hybridisation of Be is `sp^(2)`.

At high temperatures (above 1200K) dimer is dissociated to form linear monomer. In monomer hybridisation of Be is sp. `Cl-Be-Cl`.