MCQ
Which of the following has an optical isomer
- A$[Co(en)( NH_3)_2]^{2+}$
- B$[Co(H_2O)_4 (en)]^{3+}$
- ✓$[Co(en)( NH_3)_2]^{3+}$
- D$[Co(NH_3)_3 Cl]^+$
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$\begin{array}{*{20}{c}}{ - OAc}\\{\rm{I}}\end{array}$$\begin{array}{*{20}{c}}{ - OMe}\\{{\rm{II}}}\end{array}$$\begin{array}{*{20}{c}}{ - OS{O_2}Me}\\{{\rm{III}}}\end{array}$$\begin{array}{*{20}{c}}{ - OS{O_2}C{F_3}}\\{{\rm{IV}}}\end{array}$
The order of leaving group ability is
