Which of the following statement is false ?

Options

A. Complex of Pt(+II) and Au(+III) are square planar -including those with weak field ligands such as halide ions.
B. In tetrahedral complex, the `t_(2g)` orbitals are nearer to the direction of the ligands.
C. For `d^(0),d^(5) and d^(10)` arrangement the CFSE is zero in both octahedral and tetrahedral complexes with weak field ligand
D. None

Answer

D

Explanation

(1) `Pt(+III) and Au (-III)` with `5d^(5)` configuration have greater CFSE and thus favourr square planar geometry ( i.e. `dsp^(2)` hybridisation ) with weak as well as strong field ligands.
(2) In tetrahedral complex, the `t_(2g)` orbitals are nearer to the direction of the ligands. Hence they have higher energies than that of `e_(g)` orbitals ( for detail refer text).

Similarly for `d^(0) and d^(10)` cofiguration the CFSE is zero in both octahedral and tetrahedral complexes with weak field ligands.