Which of the following species participates in the sulphonation of the benzene ring?

Which catalyst is used in the following reaction?

Identify products $A$ and $B$ in the following reaction scheme:
Reaction $1$: Benzene + $Cl_2$ (excess) $\xrightarrow{FeCl_3}$ $A$
Reaction $2$: Benzene + $Cl_2$ (excess) $\xrightarrow{h\nu}$ $B$

Which of the following compounds would not be considered aromatic in its behaviour?

Cyclopentadiene is much more acidic than cyclopentane. The reason is that

Give the reaction for $n$-hexane reacting in the presence of a catalyst (aromatization).