In the following reaction,the catalyst used is:

Using anhydrous $AlCl_3$ as a catalyst,which one of the following reactions produces ethylbenzene $(PhEt)$?

The correct order of reactivity towards the electrophilic substitution of the compounds aniline $(I)$,benzene $(II)$,and nitrobenzene $(III)$ is

Rank the following compounds in decreasing order of reactivity towards Electrophilic Aromatic Substitution $(EAS)$ reaction:
$(a)$ $Toluene$
$(b)$ $Nitrobenzene$
$(c)$ $Benzene$
$(d)$ $Chlorobenzene$

Among the following,the aromatic compounds are:

In the conversion of $A$ to $B$,the electrophile involved is: