Which of the following will exhibit optical isomerism?

{[C r (e n) {(H_{2} O)}_{4}]}_{4}^{3 +}

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{[C r {(e n)}_{3}]}_{3}^{3 +}

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t r a n s - {[C r (e n) {(C l)}_{2} {(N H_{3})}_{2}]}_{2}^{+}

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{[C r {(N H_{3})}_{6}]}_{6}^{3 +}

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Solution

The correct option is D ${[C r {(e n)}_{3}]}_{3}^{3 +}$
Optical isomerism is very commomn with octahedral complexers of the type $M (A A)_{3}, M (A A)_{2} a b, M (A A) a_{2} b_{2}, M (A A) (B B) a_{2}$ etc. A few typical examples are shown in figure.
Apart from $[C r (e n)_{3}]^{3 +}$ compounds, other dont show optical isomerism due to presence of symmetry.

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

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