JEE Main · 2009 · 12 Apr 2009 · Offline · Coordination Compounds

Which of the following has an optical isomer ?

(A) $[CO (NH_{3})_{3} Cl]^{+}$
(B) $[CO (en) (NH_{3})_{2}]^{2 +}$
(C) $[CO (H_{2} O)_{4} (en)]^{3 +}$
(D) $[CO (en)_{2} (NH_{3})_{2}]^{3 +}$ ✓ Correct

Answer: (D)

Solution

Optical isomerism in an octahedral complex needs the molecule to lack any plane of symmetry. The ion

[Co (en)_{2} (N H_{3})_{2}]^{3 +}

is of the type with two bidentate chelate rings and two like monodentate groups; in its cis arrangement it has no mirror plane and so exists as a non-superimposable pair of mirror images, giving optical activity. The other complexes each possess a symmetry plane and are not chiral.

JEE Main · 2009 · 12 Apr 2009 · Offline · Single correct option

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