The reagent used in Friedel-Crafts reaction is:

Arrange the following compounds in the decreasing order of their reactivity towards electrophilic substitution reaction: Aniline $(I)$,Benzene $(II)$,and Nitrobenzene $(III)$.

What is the number of $\sigma$ and $\pi$ bonds in toluene?

In Friedel-Crafts alkylation,besides $AlCl_3$ the other reactants are

What is the number of monosubstituted products possible for benzene?

Benzene reacts with $CH_3COCl$ in the presence of $AlCl_3$ to give