With the help of polarity of the carbon halogen bond show that aryl halides are less reactive than alkyl halides.

Explanation

In alhyl halide, the electron rich nucleophite is aitračied by the carbon atom carrying slight positive charge, leading to the formation of products. In aryl.halide, there is replusion between electron rich nucleophiile and electron rich benzene ring having delocalised Telectron bond. Due to this replusion, it is less likely for the electrons rich nucleophile to approach electron rich arenes.