Nitrobenzene on reaction with conc. HNO₃/H₂SO₄ at 80-100⁰C forms which one of the following products?

• 1,2-dinitrobenzene

• 1,3- dinitrobenzene

• 1,4-dinitrobenzene

• 1,4-dinitrobenzene

42.

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

• -CN

• -SO₃H

• -COOH

• -COOH

Which of the following compounds will not undergo Friedel -Craft's reaction easily?

• Cumene

• Xylene

• Nitrobenzene

• Nitrobenzene

In the reaction,

• HgSO₄/H₂SO₄

• Cu₂Cl₂

• H₃PO₂ and H₂O

• H₃PO₂ and H₂O

Which is the monomer of neoprene in the following