Chemistry - Coordination Chemistry Question with Solution | TestHub

The incorrect statements are A, B, and C.

A. The chelate effect makes $[\mathrm{Cd}(\mathrm{en}{)}_2{]}^{2+}$ more stable due to a greater increase in entropy.

B. $[\mathrm{Ni}(\mathrm{en}{)}_3{]}^{2+}$ is more stable than $[\mathrm{Ni}({\mathrm{NH}}_3{)}_6{]}^{2+}$ due to the chelate effect.

C. Stability generally increases down a group for transition metal complexes, so $[\mathrm{Rh}(\mathrm{CN}{)}_6{]}^{3-}$ is more stable than $[\mathrm{Co}(\mathrm{CN}{)}_6{]}^{3-}$.