Give reason Haloalkanes undergo nucleophilic substitution reaction easily but haloarenes do not undergo nucleophilic substitution under ordinary conditions.
Because haloalkanes are more polar than haloarenes, they are more prone to nucleophilic substitution reactions. The reason for this is that the carbon atom linked to the halogen atom in haloalkanes is sp3sp3 hybridized, whereas it is sp2sp2 hybridised in haloarenes. The electronegativity difference in the CX bond of haloalkanes is higher because an sp3sp3 hybridized carbon is less electronegative than a sp2sp2 hybridised carbon, making them more polar.
