Answer:
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.
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