Some $meta$-directing substituents in aromatic substitution are given. Which one is most deactivating?
- A$-COOH$
- B$-NO_2$
- C$-C \equiv N$
- D$-SO_3H$
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When a mixture of concentrated $HNO_3$ and $H_2SO_4$ reacts with benzene at $353 \, K$,what is the name of this reaction?
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