Which among the following complexes is a homoleptic and cationic in nature?

Which among the following complexes is a homoleptic and cationic in nature?
  1. $\left[\mathrm{CoCl}_{2}(\mathrm{en})_{2}\right] \mathrm{Cl}$
  2. $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}$
  3. $\mathrm{K}\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]$
  4. $\left[\mathrm{F}_{\mathrm{e}}(\mathrm{CO})_{5}\right]$

Solution

$\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3} \rightleftharpoons\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}+3 \mathrm{Cl}^{-}$ i. Homoleptic - $\mathrm{Fe}$ is linked to only one type of ligand, $\mathrm{H}_{2} \mathrm{O}$. ii. Cationic Complex - due to positive charge on complex ion.

Asked in: MHT CET 2020 (13 Oct Shift 2)

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