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Q.
Benzene does not undergo addition reaction easily because :
AFMCAFMC 2001
Solution:
Benzene is an aromatic compound. It is cyclic planar, conjugated system containing $ (4n+2)\pi e^{-} $ which are delocalised. Due to this delocalization of $ \pi e^{-} $ (resonance) benzene possess a high degree of stability and does not readily undergo addition reaction.