When a mixture of concentrated $HNO_3$ and $H_2SO_4$ reacts with benzene at $353 \, K$,what is the name of this reaction?

Which of the following ring compounds obeys Huckel's rule?

Styrene at room temperature is

Which of the following compounds forms ortho-benzenedicarboxylic acid when oxidized by hot aqueous potassium permanganate?

The heat of hydrogenation of one double bond in cyclohexene is $28.6 \, kcal \, mol^{-1}$ and the heat of hydrogenation of benzene to cyclohexane is $50 \, kcal \, mol^{-1}$. The resonance stabilization energy of benzene is ...... $kcal \, mol^{-1}$.

The compounds $A$ and $B$ are respectively