Optical isomerism is exhibited by:
(ox = oxalate anion; en = ethylenediamine).

c i s - [C r C l_{2} (o x)_{2}]^{3 -}

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[C o (e n)_{3}]^{3 +}

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t r a n s - [C r C l_{2} (o x)_{2}]^{3 -}

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[C o (o x) (e n)_{2}]^{+}

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Solution

The correct options are
A $[C o (e n)_{3}]^{3 +}$
B $c i s - [C r C l_{2} (o x)_{2}]^{3 -}$
C $[C o (o x) (e n)_{2}]^{+}$
Optical isomerism is exhibited by the complexes $c i s - [C r C l_{2} (o x)_{2}]^{3 -},$ $[C o (e n)_{3}]^{3 +}$ and $[C o (o x) (e n)_{2}]^{+}$ .

They can be resolved into d and l isomers.
$t r a n s - [C r C l_{2} (o x)_{2}]^{3 -}$ is optically inactive as it has a plane of symmetry.

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[{Ru(bipyridyl)}_{3})]^{2 +}, [C r (E D T A)]^{2 +}, trans- [C r C l_{2} (o x)_{2}]^{3 -}

cis- [C r C l_{2} (o x)_{2}]^{3 -}

(i) [C o (N H_{3})_{4} (H_{2} O) C l]^{2 +} (i i) [P t (N H_{3})_{2} C l_{2}] (i i i) [C o C l_{2} (e n)_{2}]^{+} (i v) [C r (H_{2} O)_{5} C l] C l_{2} (v) [F e (N H_{3})_{2} (C N)_{4}]^{-} (v i) [C r C l_{2} (o x)_{2}]^{3 -} (v i i) K [C o (H_{2} O)_{2} (o x)_{2}] (v i i i) [C o (N H_{3})_{2} C l_{2} (e n)]^{+} (i x) [C o (e n)_{3}] C l_{3}

cis-trans

- [C o (N H_{3})_{4} C l_{2}]^{+}

- [C o (e n)_{2} C l_{2}]^{+}

- [C o (e n)_{2} C l_{2}]^{+}

[C o (e n)_{3}]^{3 +}

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