# Which of the following complexes is used as an anti-cancer agent: Option 1) $mer-\left [ Co(NH_{3})_{3}Cl_{3} \right ]$ Option 2) $cis-\left [ PtCl_{2}(NH_{3})_{2} \right ]$ Option 3) $cis-K_{2}\left [ PtCl_{2}Br_{2} \right ]$ Option 4) $Na_{2}CoCl_{4}$

As we learned in concept

Geometrical Isomers -

This is due to the difference in relative position of the ligands attached to the central metal atom with respect to each other

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Cis $[Pt\:Cl_{2}(NH_{3})_{2}]$ and is used as an anti cancer agent.

Option 1)

$mer-\left [ Co(NH_{3})_{3}Cl_{3} \right ]$

This option is incorrect.

Option 2)

$cis-\left [ PtCl_{2}(NH_{3})_{2} \right ]$

This option is correct.

Option 3)

$cis-K_{2}\left [ PtCl_{2}Br_{2} \right ]$

This option is incorrect.

Option 4)

$Na_{2}CoCl_{4}$

This option is incorrect.

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