• # question_answer Why is $MgC{{l}_{2}}$ molecule linear whereas the molecule of $SnC{{l}_{2}}$ chloride has angular shape?

Let us find the hybridisation of central atom in both these molecules. In $MgC{{l}_{2}}$, hybridisation of $Mg$$=1/2[2+2-0+0]=4/2=2\,(sp)$ In $SnC{{l}_{2}}$, hybridisation of $Sn$$=1/2[4+2-0+0]=6/2=3\,(s{{p}^{2}})$ Thus, $MgC{{l}_{2}}$ is linear while $SnC{{l}_{2}}$  is expected to have planar geometry. However, the presence of a lone pair of electrons on $Sn$  atom makes it angular.