Select the incorrect statement

 $BeC{l}_2$  has same structure in both solid state and in vapour state

Bicarbonates of alkaline earth metals do not exist in solid state but exists in solutions only

Down the group, as the size of cation  $\left(M^{2+}\right)$  increases, the ease of formation and stability of peroxide formed also increases

$Be{H}_2$  is covalent and polymeric