The cis isomer exist in two optical isomers. In the case of trans isomer optical isomerism not possible.
In octahedral complexes of the type $M ( A )_4 X _2$ like $\left[ Co \left( NH _3\right)_4 Cl _2\right]^{+}$the optical isomerism is not possible.
$A.$ $\left[ Fe ( CN )_6\right]^{3-}$;$B.$ $\left[ FeF _6\right]^{3-}$; $C.$ $\left[ CoF _6\right]^{3-}$; $D.$ $\left[ Cr (\text { oxalate })_3\right]^{3-}$; $E.$ $\left[ Ni ( CO )_4\right]$
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