MCQ
Which is correct ?


- Achiral
- B$C_3$ axis of symmetry
- COptically active
- ✓All of these


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$(A)$ $O _2$ 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