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.
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