The Δt of the following complexes follows the order (I) [ CoCl 4]2- (II) [ CoBr 4]2- (III) [ Co ( NCS )4]2-

Question

The Δt of the following complexes follows the order (I) [ CoCl 4]2- (II) [ CoBr 4]2- (III) [ Co ( NCS )4]2- (A) III > I > II (B) III > II > I (C) II > I > III (D) I > II > III

Tardigrade Admin · Accepted Answer

The order of CFSE for tetrahedral complexes [CoCl4]2-< [CoBr4]2-< [ Co ( NCS )4]2-

Q. The $Δ_{t}$ of the following complexes follows the order
(I) $[C o C l_{4}]^{2 -}$
(II) $[C o B r_{4}]^{2 -}$
(III) $[C o (NCS)_{4}]^{2 -}$

III > I > II

III > II > I

II > I > III

I > II > III

The order of CFSE for tetrahedral complexes $[C o C l_{4}]^{2 -} < [C o B r_{4}]^{2 -} < [C o (NCS)_{4}]^{2 -}$

Q. The Δt​ of the following complexes follows the order (I) [CoCl4​]2− (II) [CoBr4​]2− (III) [Co(NCS)4​]2−