MCQ
The molecules with most polar bond, is
- A$OF_2$
- B$SF_4$
- C$ClF$
- ✓$SiF_4$
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$R - Br + C{l^ - }\xrightarrow{{DMF}}R - Cl + B{r^ - }$ ,
which one of the following undergoes complete inversion of configuration?

$(A)$ $O _2$ is physisorbed
$(B)$ heat is released
$(C)$ occupancy of $\pi_{2 p }^*$ of $O _2$ is increased
$(D)$ bond length of $O _2$ is increased