. Which one of the following complexes shows optical isomerism

A. cis [Co(en)2 C12] C1

B. trans [Co(en)2 C12] C1

C. [Co(NH3)4 C12]

D. [Co(NH3)3 C13] ( en = ethylenediamine)

Best Answer


  • The optically active compound is capable of rotating plane polarized light to the right or left.
  • cis [Co(en)2 C12] C1 shows optical isomerism. It exists in the form for d and 1 forms.
  • Trans isomer is optically inactive meso compound.

Final answer:

The correct option is A: cis [Co(en)2 C12] C1. 

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