MCQ
Nitration takes place at the which position of the given compound ?


- A$A$
- ✓$B$
- C$C$
- D$D$

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Assertion $A$: Helium is used to dilute oxygen in diving apparatus.
Reason $R:$ Helium has high solubility in $O _2$.
In the light of the above statements, choose the correct answer from the options given below

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The correct statement about $P, Q, R$, and $S$ is