Which one of the following complexes shows optical isomerism?
(en = ethylenediamine)
(en = ethylenediamine)
Show Hint
- cis\(\mathrm{[Co(en)_2Cl_2]Cl}\)
- trans\(\mathrm{[Co(en)_2Cl_2]Cl}\)
- \(\mathrm{[Co(NH_3)_4Cl_2]Cl}\)
- \(\mathrm{[Co(NH_3)_3Cl_3]}\)
The Correct Option is A
Solution and Explanation
(2) trans-\(\mathrm{[Co(en)_2Cl_2]^+}\) has a plane of symmetry, so it is achiral.
(3) \(\mathrm{[Co(NH_3)_4Cl_2]^+}\) (cis or trans) has a plane of symmetry, achiral.
(4) \(\mathrm{[Co(NH_3)_3Cl_3]}\) (fac and mer) both have a plane of symmetry, achiral.
(1) cis-\(\mathrm{[Co(en)_2Cl_2]^+}\) has no plane or centre of symmetry; it exists as a pair of non-superimposable mirror images (enantiomers).
Answer: (1) cis\(\mathrm{[Co(en)_2Cl_2]Cl}\)
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