In which of the following pairs both the complexes shoy optical isomerism?

1. $\mathrm{cis}-\left[\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{O}_{4}ight)_{2} \mathrm{Cl}_{2}ight]^{3-}$, cis- $\left[\mathrm{Co}\left(\mathrm{NH}_{3}ight)_{4} \mathrm{Cl}_{2}ight]$
2. $\left[\mathrm{Co}(\mathrm{en})_{3}ight] \mathrm{Cl}_{3}$, cis $\left.-\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}ight] \mathrm{C}ight]$
3. $\left[\mathrm{Co}\left(\mathrm{NO}_{3}ight)_{3}\left(\mathrm{NH}_{3}ight)_{3}ight]$, $\operatorname{cis}-\left[\mathrm{Pt}(\mathrm{en})_{2} \mathrm{Cl}_{2}ight]$
4. $[\mathrm{PtCl}(\mathrm{en}) \mathrm{Cl}]$, $\left[\mathrm{NiCl}_{2} \mathrm{Br}_{2}ight]^{2-}$

Solution

$\left[\mathrm{Co}(\mathrm{en})_{3} \mathrm{Cl}_{3}ight]$ i.e., $\left[\mathrm{Co}(\mathrm{en})_{3}ight]^{3+}$


cis $-\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}ight] \mathrm{Cl}$ i.e. cis $-\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}ight]^{2+}$ ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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