About aromatic compound(20分)

Question

why aromatic compounds are not favour to undergo eletrophilic additions

Answer 1

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In the aromatic ring, each carbon atom has 4 valence electrons. Three of them form 3 covalent bonds with neighbouring atoms and 1 π electron is left unbonded. The π electrons delocalize above and below the aromatic ring, and thus the aromatic ring becomes more stable. The energy lowered to stabilize the aromatic ring is called stabilization energy.

If electrophilic addition occurred, 2π electrons would be used to form covalent bonds. This breaks down the system of delocalization of π electrons, and stabilization energy would be lost. As this is energy unfavorable, electrophilic addition would not occurs.

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