Which type of reaction takes place in aromatic compounds?

The carbon - carbon bond length is  in the cast of_____________

According to Huckel's rule, the number of p electrons in benzene is equal to____________

Delocalized electrons are present in the molecules of_____________

The diagonal structure of benzene was proposed by________________

How many isomeric compounds will be obtained  when a disubstituted derivative of benzene is prepared from its monosubstituted derivative ?

How many nuclei are shared in localized chemical bonding?