Which of the following statements is not true about the complex ion ${[C r C l_{2} {(e n)}_{2}]}_{2}^{+}$ ?

It has two geometrical isomers

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cis and trans.

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Both the cis and trans isomers display optical activity.

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Only the cis isomer displays optical activity.

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Only the cis isomer has nonsuperimposable mirror image.

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Solution

The correct option is B Both the cis and trans isomers display optical activity.
Due to symmetry trans $[C r C l_{2} (e n)_{2}]^{+}$ is optically inactive.

Hence statement B is not correct.

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

The cis-isomer of which of the following ions will have optical isomers but the trans-isomer will not?

[M (A B) b_{2} c d]

[C o (N H_{3})_{4} B r_{2}]^{+} \to [C o (N H_{3})_{3} B r_{3}] + N H_{3}

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

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