Which of the following are inner orbital complex (i.e., involving $\mathrm{d}^{2} \mathrm{sp}^{3}$…

Which of the following are inner orbital complex (i.e., involving $\mathrm{d}^{2} \mathrm{sp}^{3}$ hybridisation) and is paramagnetic in nature?
  1. $\left[\mathrm{Mn}(\mathrm{CN})_{6}ight]^{3-},\left[\mathrm{Fe}(\mathrm{CN})_{6}ight]^{3-},\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}ight)_{3}ight]^{3-}$
  2. $\left[\mathrm{MnCl}_{6}ight]^{3-},\left[\mathrm{FeF}_{6}ight]^{3-},\left[\mathrm{CoF}_{6}ight]^{3-}$
  3. $\left[\mathrm{Mn}(\mathrm{CN})_{6}ight]^{3-},\left[\mathrm{Fe}(\mathrm{CN})_{6}ight]^{3-}$
  4. $\left[\mathrm{MnCl}_{6}ight]^{3-},\left[\mathrm{Fe}(\mathrm{CN})_{6}ight]^{3-},\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}ight)_{3}ight]^{3-}$

Solution

$\left[\mathrm{Mn}(\mathrm{CN})_{6}ight]^{3-}$ and $\left[\mathrm{Fe}(\mathrm{CN})_{6}ight]^{3-}$ are inner orbital
complexes and paramagnetic while $\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}ight)_{3}ight]^{3-}$ is diamagnetic in nature.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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