# Which one of the following has a square planar geometry

$(a)\;[COCl_4]^{2-}\qquad(b)\;[FeCl_4]^{2-}\qquad(c)\;[NiCl_4]^{2-}\qquad(d)\;[PtCl_4]^{2-}$

$[PtCl_4]^{2-}$ has a square planar geometry
Hence (d) is the correct answer.