Question

Among the following complexes, optical activity is possible
in
(a) [Co(NH₃)₆ ]³⁺
(b) [Co(H₂O)₂ (NH₃ )₂Cl₂ ]⁺
(c) [Cr(H₂O)₂Cl₂ ]⁺
(d) [Co(CN)₅NC]

Answer 1

The optical activity is possible in [Co(H₂O)₂ (NH₃ )₂Cl₂ ]⁺.

Option (B) is correct.

Explanation:

• Optical activity is possible in the complex Co(H2 O) 2  (NH 3 ) 2 Cl 2 ]  +
• It is complex of the type [Ma2b2c2] where, a, b and c are mono-dentate ligands.
• In this complex, no element of symmetry is present.
• Therefore, it is optically active.
• It exists in the form of a pair of enantiomers (d and l isomers).

Thus the optical activity is possible in [Co(H₂O)₂ (NH₃ )₂Cl₂ ]⁺.

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