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Question

Which of the following does not have optical isomers ?

A
[Co(en)3]Cl3
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B
[Co(NH3)3Cl3]
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C
[Co(en)2Cl2]Cl
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D
[Co(en)(NH3)2Cl2]Cl
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Solution

The correct option is B [Co(NH3)3Cl3]
The complex [Co(NH3)3Cl3] does not have optical isomers due to presence of an element of symmetry. However, it exists in two geometrical isomers which are cis and trans or fac and mer isomers.

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