Name the electrophile produced in the reaction of benzene with benzoyl chloride in the presence of anhydrous $AlCl_3$. Name the reaction also.

When benzene is chlorinated in the presence of $FeCl_3$,the electrophile is .......

The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reaction is:

Which among the following pairs of the structures will give different products on ozonolysis? (Consider the double bonds in the structures are rigid and not delocalized.)

The compound that is most reactive towards electrophilic nitration is

Toluene reacts with mixed acid at $25^{\circ} C$ to produce