Question

$AC{l}_3$ is trigonal pyramidal and $EC{l}_3$ is trigonal planar. These two combine to give $AEC{l}_6$. Crystallographic studies and structural analysis reveal that $AEC{l}_6$ is an ionic compound. If the shape of the anion is tetrahedral, then the shape of the cation is:

• A. Tetrahedral
• B. Bent
• C. Linear
• D. Trigonal planar

Answer 1

The correct option is B

Bent

The anion is tetrahedral. This could happen if a chloride is abstracted from $AC{l}_3$ and given to $EC{l}_3$so that the latter becomes $EC{l}_4^{-}$. The cation would then be $AC{l}_2^{+}$​​​ - a cation with a lone pair and 2 ligands. This would be $s{p}^2$ – a bent molecule.