question_answer 1)

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

Answer:

  Alkenes and arenes both are unsaturated and electron rich. Olefins or alkenes undergo addition reaction to give more stable saturated product; in this reaction hybridization changes from \[s{{p}^{2}}\]to\[s{{p}^{3}}\].         Arenes are stabilised by resonance w delocalization of\[\pi \]-electrons. On addition reaction to the double bond of arene, we get a product which is not resonance stabilised. Thus, arenes prefer to undergo substitution reaction while alkenes prefer to undergo addition reaction.