$\text{CCl}_2\text{FCClF}_2$ may be changed into $\text{CH}_2\text{FCF}_3$ by the route shown below. Stage 1: $\text{CCl}_2\text{FCClF}_2 \rightarrow \text{CCl}_2\text{CF}_3$ Stage 2: $\text{CCl}_2\text{CF}_3 \rightarrow \text{CCl}_2\text{FCF}_3$ Stage 3: $\text{CCl}_2\text{FCF}_3 \rightarrow \text{CH}_2\text{FCF}_3$ What type of reaction occurs in stage 1?
- Aaddition
- Belimination
- Cisomerisation
- Doxidation