Question

The species having tetrahedral geomerty among the following is:

• A. $[PdC{l}_4{]}^{2-}$
• B. $\left[Ni\right(CN{)}_4{]}^{2-}$
• C. $\left[Pd\right(CN{)}_4{]}^{2-}$
• D. $\left[Ni\right(Cl{)}_4{]}^{2-}$

Answer 1

The correct option is D $\left[Ni\right(Cl{)}_4{]}^{2-}$

For the coordination number 4, strong field ligands give square planar complexes. $C{N}^{-}$ is a strong field ligand, so $\left[Ni\right(CN{)}_4{]}^{2-}$ has a square planner geometry.

As we move from the first to the second transition series, the crystal field splitting energy increases. Hence, the second transition series form square planar complexes. So, $[PdC{l}_4{]}^{2-}$ and $\left[Pd\right(CN{)}_4{]}^{2-}$ have square planar geometry.
Hence (d) is the correct answer.