Which of the following is not optically active?

CHEMISTRY · Single correct · CBSE · Chemistry · Coordination Compounds · Coordination Compounds

Problem

Which of the following is not optically active? (1) [Co(en)3]3+[\text{Co}(\text{en})_3]^{3+} (2) [Cr(Ox)3]3−[\text{Cr}(\text{Ox})_3]^{3-} (3) cis−[CoCl2(en)2]+\text{cis}-[\text{CoCl}_2(\text{en})_2]^+ (4) trans−[CoCl2(en)2]+\text{trans}-[\text{CoCl}_2(\text{en})_2]^+

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