After ozonolysis of benzene (not hydrolysis),the product is

Why does benzene undergo electrophilic substitution reactions easily and nucleophilic substitutions with difficulty?

The order of decreasing reactivity towards an electrophilic reagent,for the following would be:
$a$. Benzene
$b$. Toluene
$c$. Chlorobenzene
$d$. Phenol

The rate-determining step for the preparation of nitrobenzene from benzene is:

The best reagent for nuclear iodination of aromatic compounds is:

Which aromatic compound possesses a seven-membered ring?