The complex which has facial and meridional isomers is (Given : py...

Facial and meridional isomerism is exhibited by octahedral complexes of the type $[MA_3B_3]$.

$[\text{Ni(en)}_2(\text{H}_2\text{O})_2]^{2+}$ is of the type $[M(AA)_2B_2]$, which shows cis and trans isomerism.

$[\text{Cr(py)}_3(\text{Cl})_3]$ is of the type $[MA_3B_3]$, which shows facial (fac) and meridional (mer) isomerism.

$[\text{Cr(H}_2\text{O})_6]^{3+}$ is of the type $[MA_6]$, which does not show geometrical isomerism.

$[\text{Co(NH}_3)_4(\text{H}_2\text{O})_2]^{3+}$ is of the type $[MA_4B_2]$, which shows cis and trans isomerism.

Answer: $[\text{Cr(py)}_3(\text{Cl})_3]$