11th Class Chemistry Hydrocarbons

  • question_answer 59)   Why do alkenes prefer to undergo electrophilic addition reaction while arenes prefer electrophilic substitution reactions? Explain.


      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.                

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