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Question

Which of the following complexes is not expected to exhibit optical isomerism ?


A

[Co(en)2Cl2]

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B

[Co(NH3)3Cl3]

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C

[Co(en)(NH3)2Cl2]

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D

[Co(en)3]3+

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Solution

The correct option is B

[Co(NH3)3Cl3]


[Co(NH3)3Cl3] i.e., Ma3b3 type exists in two geometrical forms (facial and meridional)

Both of these are achiral. Hence (b) does not show optical isomerism.

Note: M(aa)2b2, M(aa)b2c2 and M(aa)3 types show optical isomerism.

But Ma4b2 or Ma2b4 type shown only geometrical isomers.


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