MCQ
Aniline on treatment with conc. $HN{O_3} + $ conc. ${H_2}S{O_4}$ mixture yields
- A$o- $and $p-$nitroanilines
- B$m-$nitroanilines
- ✓A black tarry matter
- DNo reaction

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