Which of the following complex will show geometrical as well as optical isomerism?

[P t {(N H_{3})}_{2} C l_{2}]

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[P t {(N H_{3})}_{2} C l_{4}]

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{[P t {(e n)}_{3}]}_{3}^{4 +}

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[P t (e n)_{2} C l_{2}]

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Solution

The correct option is C $[P t (e n)_{2} C l_{2}]$
The complexes $[P t {(N H_{3})}_{2} C l_{2}]$ and $[P t {(N H_{3})}_{2} C l_{4}]$ show geometrical isomerism. They exist in the form of cis and trans isomers. However, they do not show optical isomerism.
The complex ${[P t {(e n)}_{3}]}_{3}^{4 +}$ shows optical isomerism. It exists in the form of d and l isomers. It does not show geometrical isomerism.
The complex $[P t (e n)_{2} C l_{2}]$ shows two geometrical isomers, cis and trans. The cis isomer is optically active and exists in d and l forms. The trans isomer is optically inactive.

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