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

c i s - [C r (C_{2} O_{4})_{2} C l_{2}]^{3 -}, c i s - [C o (N H_{3})_{4} C l_{2}]

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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} B r_{2}]^{2 -}

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

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Solution

The correct option is C $[C o (e n)_{3}] C l_{3}, c i s - [C o (e n)_{2} C l_{2}] C l$
For the complex to be optically active, it should be chiral i.e all the four valencies should have different groups or there should be absence of centre of symmetry, plane of symmetry and axis of symmetry.
In option b, the complexes have bidentate ligands in which none of the elements of symmetry is present. Therefore, they can show optical isomerism.

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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. Define the cis-trans isomerism? Show the cis-trans isomers of

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

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.

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