The structures of beryllium chloride in solid state and vapour phase, are:

The structures of beryllium chloride in solid state and vapour phase, are:
A Linear in both
B Dimer and Linear, respectively
C Chain in both
D Chain and dimer, respectively

Detailed Solution

In the solid state, $BeCl_2$ exists in a polymeric chain form (bridging Cl atoms).
In the vapour state, it exists as a chlorine-bridged dimer (which dissociates into linear monomers at very high temperature).
So the structures are chain and dimer, respectively.

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