Which product is obtained when benzene is heated with chlorine in the presence of sunlight?

Are all $ortho$ and $para$ directing groups activators? Give examples.

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

Among $P$,$Q$,$R$ and $S$,the aromatic compound$(s)$ is/are:

To convert cyclononatetraene into an aromatic ion,the process needed is

Which of the following compounds has two different $C-C$ bond lengths?