Question

Which of the following does not show optical isomerism?
(a) [Co(NH₃)₃Cl₃]⁰ (b) [Co (en) Cl₂(NH₃)₂]⁺
(c) [Co (en)₃]³⁺ (d) [Co (en)₂Cl₂]⁺
(en = ethylenediamine)

Answer 1

Answer:

a is the right answer

Answer 2

[Co (en)₃]³⁺ will not have optical isomerism.

Explanation:

• Optical isomerism is the property of a substance by which it can deflect plane polarised light.

• The optical isomerism is shown by those molecules which doesn't have a plane of symmetry in them.

• All the complex ions that are mentioned here do have one unsymetry in their structure.

• This leads to the presence of optical isomerism in them.

• But in case of  [Co (en)₃]³⁺, there's symmetry in all planes.

• So it cannot show optical isomerism.

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