Q. Which of the following has an optical isomer?

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$\left(\left[C o \left(e n\right) \left(N H_{3}\right)_{2}\right]\right)^{2 +}$

$\left(\left[C o \left(H_{2} O\right)_{4} \left(e n\right)\right]\right)^{3 +}$

$\left(\left[C o \left(e n\right)_{2} \left(N H_{3}\right)_{2}\right]\right)^{3 +}$

$\left(\left[C o \left(N H_{3}\right)_{3} C l\right]\right)^{+}$

Solution:

It is an octahedral complex of the type $\left[\right.M\left(\right.AA\left(\left.\right)_{2}X_{2}\left]\right.$ and capable of showing optical isomerism. As in rest others there is symmetry, so no optical isomerism is possible.

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