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

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${[Co (en)_{3}] {Cl}_{3}, cis-[Co(en))}_{2} {Cl}_{2}] Cl$

$cis- {[Cr {(C_{2} O_{4})}_{2} {Cl}_{2}]}^{3 -}, trans- [Co {({NH}_{3})}_{4} {Cl}_{2}]$

$[PtCl (dien)] Cl, {[{NiCl}_{2} {Br}_{2}]}^{2 -}$

${[Co {({NO}_{3})}_{3} {({NH}_{3})}_{3}], cis-[Pt(en)}_{2} {Cl}_{2}]$

answer is B.

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Detailed Solution

$[C o (e n)_{3}] C l_{3}, c i s - [C o (e n)_{2} C l_{2}] C l$ Because neither of the complexes exhibits any symmetry components, they both exhibit optical isomerism.

Mirror images of each other cannot be superimposed over optical isomers. Optically isomeric compounds are those with coordination numbers 4 and 6.

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