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

hydrocarbons
cbse

#1

Due to the presence of delocalisation of sextet of Pi electrons (671 electrons), benzene behaves as a rich source of electrons [Lewis Base]. It is thus readily attacked by electrophiles [reagents deficient in electrons] rather than nucleophiles thus giving electrophilic substitution reactions.