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Which one of the following complexes shows optical isomerism?

Options

  1. A[ C o N H 3 ) 3 B r 3
  2. B[ C o ( N H 3 ) 4 B r 2 ] B r
  3. Ctrans-[Co en) 2 Br 2 Br
  4. Dc i s [ C o ( e n ) 2 C l 2 ] C l (en = ethylenediamine)

Correct answer

D. c i s [ C o ( e n ) 2 C l 2 ] C l (en = ethylenediamine)

Step-by-step solution

Complex [ C o ( N H 3 ) 4 B r 2 ] B r have two G.I. which are optically inactive due to presence of plane of symmetry. Complex [ C o ( N H 3 ) 3 B r 3 ] also have two optically inactive geometrical isomers due to presence of plane of symmetry. complex trans-[Co en) 2 Br 2 Br is optically inactive. Complex c i s [ C o ( e n ) 2 C l 2 ] C l is optically active due to formation of non-superimposable mirror image

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