In the mixture of conc. $H_2SO_4$ and $HNO_3$,the nitrating species is:

Which of the following has the lowest heat of combustion?

The addition of $Cl_2$ to benzene in the presence of $AlCl_3$ is an example of:

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 ...... $kcal \, mol^{-1}$.

Which of the following reacts with benzene in the presence of anhydrous aluminum chloride to form acetophenone?

Suitable conditions to prepare hexachlorobenzene $(C_6Cl_6)$ from benzene $(C_6H_6)$ is/are: