JEE Main · 2013 · 07 Apr 2013 · Offline · Coordination Compounds

Which of the following complex species is not expected to exhibit optical isomerism?

(A) $[Co (en)_{2} Cl_{2}]^{+}$
(B) $[Co (NH_{3})_{3} Cl_{3}]$ ✓ Correct
(C) $[Co (en) (NH_{3})_{2} Cl_{2}]^{+}$
(D) $[Co (en)_{3}]^{3 +}$

Answer: (B)

Solution

Optical isomerism needs a chiral complex, one with no plane of symmetry. The complex

[Co (NH X_{3}) X_{3} Cl X_{3}]

comes only as its facial and meridional geometric forms, and each of those possesses a mirror plane, so neither is chiral. This complex therefore does not show optical isomerism, unlike the chelated

[Co (en) X_{3}] X^{3 +}

and the mixed-ligand ions, which do.

JEE Main · 2013 · 07 Apr 2013 · Offline · Single correct option

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