MCQ
The above reaction completes with the mechanism


- ANucleophilic substitution -elimination mechanism
- BElectrophilic addition -elimination mechanism
- CElectrophilic substituion -elimination mechanism
- ✓Nucleophilic addition -elimination mechanism

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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
