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Which of the following compound shows optical isomerism

$(a)\;[Cu(NH_3)_4]^{+2}\qquad(b)\;[ZnCl_4]^{-2}\qquad(c)\;[Cr(C_2O_4)_3]^{-3}\qquad(d)\;[CO(CN)_6]^{-3}$

$[Cr(C_2O_4)_3]^{-3}$ shows optical isomerism
Hence (c) is the correct answer.