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Halo arenes are less reactive towards nucleophilic substitution reaction than halo alkanes. Give reason. |
Answer» SOLUTION :In halo alkanes, the halogen atom is attached to the carbon atom. As the halogen atom is more electronegative than carbon, the bond between carbon and halogen is POLAR in character.  DUE to the presence of partial positive charge on C-atom, the nucleophiles can attack on electron deficient carbon there by resulting in the displacement of weaker nucleophile, thus reaction of alkyl halide are nucleophilic substitution reaction. `R, X^(-) +Z to R : Z+X^(-) ("Halide ion")` Where as in halo arenes e.g.  halogen atom attached to benzene RING releases electrons towards benzene ring (+m effect) then by the ortho and PARA regions become site of attack for nucleophiles than the electrophiles. 
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