Why do alkenes prefer to undergo electrophilec addition reaction while arenes prefer electrophilic substitution reactions ? Explain.

Explanation

Haloalkanes are more polar than haloarenes. Therefore, the carbon atom carrying the halogen in haloalkanes is more electron deficient (i.e., more positively charged) than that in haloarenes. As a result, haloalkanes undergo nucleophilic substitution reactions more readily than haloarenes.
On the other hand, haloarenes contain a benzene ring. Since the typical reactions of benzene are electrophilie substitution reactions, therefore, haloarenes undergo electrophilic substitution reactions preferably while haloalkanes which donot contain a benzene ring donot undergo electrophilic substitution reactions.