In which of the following pair(s) both the complexes show optical isomerism?

c i s - [C r (C_{2} O_{4})_{2} C l_{2}]^{3 -}, m e r - [C o (g l y)_{3}]

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[C o (e n)_{3}] C l_{3}, c i s - [C o (e n)_{2} C l_{2}] C l

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[P t C l (d i e n)] C l, [N i C l_{2} (P P h_{3})_{2}]

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[C o (N O_{3})_{3} (N H_{3})_{3}], c i s - [P t (e n)_{2} C l_{2}] C l_{2}

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Solution

The correct options are
C $[C o (e n)_{3}] C l_{3}, c i s - [C o (e n)_{2} C l_{2}] C l$
D $c i s - [C r (C_{2} O_{4})_{2} C l_{2}]^{3 -}, m e r - [C o (g l y)_{3}]$
$[P t C l (d i e n)] C l$ , complex is square planar. It has a plane of symmetry and is optically inactive.
The complex $[N i C l_{2} (P P H_{3})_{2}]$ is tetrahedral and of the type $[M a_{2} b_{2}]$ . It is also optically inactive.
$[C o (N O_{3})_{3} (N H_{3})_{3}]$ is of the type $[M a_{3} b_{3}]$ and has a plane of symmetry. It is optically inactive.
Hence, all these compounds are optically inactive. The remaining compounds show optical activity.

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Similar questions

Q. Which of the following compounds show optical isomerism?
I. cis

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

II. trans

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

III. cis

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

IV.

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

Q. Which of the following statements is not true about the complex ion

[P t (e n)_{2} C l_{2}]^{2 +}

Identify the optically active compounds from the following
(a) $[C o (e n)_{3}]^{3 +}$
(b) $t r a n s - [C o (e n)_{2} C l_{2}]^{+}$
(c) $c i s - [C o (e n)_{2} C l_{2}]^{+}$
(d) $[C r (N H_{3})_{5} C l]$

Q. Assertion :In a coordination entity

[P t C l_{2} (e n)_{2}]^{2 +}

only the cis-isomer shows optical activity. Reason: Optical isomerism is common in octahedral complexes involving didentate ligands.

Q. Among the following complex which one shows cis-trans isomerism?

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