(a). What is the hybrid state of `Be` in `BeCl_(2)` in vapour state. What will be the change in the hybrid state of `BeCl_(2)` in the solid state?
(b). Draw the structure of `(i) BeCl_(2)` (vapour state) and (ii)` BeCl_(2)` (solid state).
(c ). Why do halides and hydrides of beryllium polymerise?

Explanation

In the vapour state at high temperature (1200 K) , Be is sp-hybridized and hence `BeCl_(2)` in linear . In the solid state , `BeCl_(2)` is polymeric . In this structure , each Be has two covalent and two coordinate bonds . Therefore , in the solid state . Be has `sp^(3)`-hybridization .