## Question

###### Which one of the following has an optical isomer? [2010](a) $left[mathrm{Zn}(mathrm{en})left(mathrm{NH}_{3}ight)_{2}ight]^{2+}$(b) $left[mathrm{Co}(mathrm{en})_{3}ight]^{3+}$(c) $left[mathrm{Co}left(mathrm{H}_{2} mathrm{O}ight)_{4}(mathrm{en})ight]^{3+}$(d) $left[mathrm{Zn}(mathrm{en})_{2}ight]^{2+}$$(mathrm{en}=$ ethylenediamine $)$

Which one of the following has an optical isomer? [2010] (a) $left[mathrm{Zn}(mathrm{en})left(mathrm{NH}_{3} ight)_{2} ight]^{2+}$ (b) $left[mathrm{Co}(mathrm{en})_{3} ight]^{3+}$ (c) $left[mathrm{Co}left(mathrm{H}_{2} mathrm{O} ight)_{4}(mathrm{en}) ight]^{3+}$ (d) $left[mathrm{Zn}(mathrm{en})_{2} ight]^{2+}$ $(mathrm{en}=$ ethylenediamine $)$

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