One among the following complex ions will not show optical activity :

[P t (B r) (C l) (l) (N O_{2}) (C_{2} H_{5} N) (N H_{3})]

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C i s - {[C o {(e n)}_{2} {C l}_{2}]}^{+}

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{[C o (e n) {(N H_{3})}_{2} {C l}_{2}]}^{+}

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[C r {(N H_{3})}_{4} {C l}_{2}]

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Solution

The correct option is D $[C r {(N H_{3})}_{4} {C l}_{2}]$
Option (D) is correct.
$[C r (N H_{3})_{4} C l_{2}]$ complex ions will not show optical activity.
Optical activity is the ability of a chiral molecule to rotate the plane of plane-polairsed light, which is shown by bidentate ligands.As this complex contains only monodentate ligand, it does not show optical activity.

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