Which of the following complex is optically inactive but its other geometrical isomer is optically active?

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Trans-diamminedichloridoplatin - (II)

trans-tetraaquadichloridocobalt(III) nitrate

Mer-triaquatrifluoridocobalt(III)

Trans-diamminebis(ethane 1, 2 diamine) cobalt (III) chloride

answer is C.

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Detailed Solution

Geometrical isomerism is observed in the complexes $[Pt {({NH}_{3})}_{2} {Cl}_{2}]$ and $[Pt {({NH}_{3})}_{2} {Cl}_{4}]$ . They come in both cis and trans isomers. They do not, however, exhibit optical isomerism.

${[Pt (en)_{3}]}^{4 +}$ exhibits optical isomerism. It comes in two isomers: d and l. It exhibits no geometrical isomerism.

There are two geometrical isomers of the complex $[Pt (en)_{2} {Cl}_{2}]$ cis and trans. The optically active cis isomer exists in d and l forms. The trans isomer has no optical activity.

$cis-[Co(en_{2} {({NH}_{3})}_{2}] {Cl}_{3}$ is optically active.

So, option C is correct answer.

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