Question

What is the hybrid state of $BeC{l}_2$ in vapour state?
If the hybrid state can be represented as $s{p}^k$, then k is :

Answer 1

In the vapour state, $BeC{l}_2$ exists as a linear molecule, ClBeCl, i.e. Be is in sp hybridized state. In the solid state, it has a polymeric structure. Each Be atom is lined with 4Cl atoms, two by covalent bonds and two by coordinate bonds.

Thus, Be atom is in the $s{p}^3$ hybridized state. Two empty orbitals and two half-filled orbitals, i.e., in all four orbitals undergo hybridization.