Which of the following is an optically active | vedclass

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(B) An optically active isomer must lack a plane of symmetry and a center of inversion.$1$. $trans-[CoCl_2(en)_2]^+$ has a plane of symmetry,so it is

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$[Cr(ox)_3]^{3-}$

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(B) An optically active isomer must lack a plane of symmetry and a center of inversion.$1$. $trans-[CoCl_2(en)_2]^+$ has a plane of symmetry,so it is optically inactive.$2$. $[Cr(ox)_3]^{3-}$ is a tris-chelated complex with $D_3$ symmetry,which is chiral and optically active.$3$. $cis-[CoCl_2(en)_2]^+$ is also chiral and optically active.$4$. $[Co(en)_3]^{3+}$ is also chiral and optically active.However,in standard multiple-choice questions of this type,$[Cr(ox)_3]^{3-}$ is a classic example of an optically active complex due to the absence of any symmetry elements.

Which of the following is an optically active isomer?

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