The correct statement(s) about $\left[\mathrm{MnCl}_6\right]^{4-},\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$ and $\left[\mathrm{MnCl}_4\right]^{2-}$ is/are

• A

  All these complexes have center of symmetry.
• B

  According to the Valence Bond Theory (VBT), the hybridization of Mn in $\left[\mathrm{MnCl}_6\right]^{4-}$ and that in $\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$ are $d^2 s p^3$ and $s p^3 d^2$, respectively.
• Correct answer
  C

  The $d-d$ electronic transition is possible in $\left[\mathrm{MnCl}_6\right]^{4-},\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$ and $\left[\mathrm{MnCl}_4\right]^{2-}$.
• Correct answer
  D

  The spin-only magnetic moments of the metal ions in $\left[\mathrm{MnCl}_6\right]^{4-}$ and $\left[\mathrm{MnCl}_4\right]^{2-}$ are equal.

Hence, the correct answer is options: 'C', 'D'.