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# Which of the following has an optical isomer

$(a)\;[CO(NH_3)_3Cl]^+\qquad(b)\;[CO(en)(NH_3)_2]^{2+}\qquad(c)\;[CO(H_2O)_4(en)]^{3+}\qquad(d)\;[CO(en)_2(NH_3)_2]^{3+}$

$[CO(en)_2(NH_3)_2]^{3+}$ has an optical isomer.
Hence (d) is the correct answer.