The $\Delta_{t}$ of the following complexes(A) $\left[\mathrm{Co}(\mathrm{Cl}_{4})\right]^{2-}$ (B) $\left[\mathrm{Co}(\mathrm{Br}_{4})\right]^{2-}$ (C) $\left[\mathrm{Co}(\mathrm{NCS})_{4}\right]^{2-}$Follows the order
(a)C > A > B
(b)A > B > C
(c)B > A > C
(d)C > B > A
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Δ_t follows the spectrochemical series of the ligands: NCS⁻ > Cl⁻ > Br⁻, i.e. C > A > B.