Chemical Properties of Halo-arenes, Halo-arenes Assignment Help

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Chemical properties of Halo-arenes

         Inert nature of chlorobenzene : Aryl halides are unreactive as compared to alkyl halides as the halogen atom in these compounds is firmly attached and cannot be replaced by nucleophiles. Such as OH-, NH2-, CN- etc.

 2104_chemical properties of haloarenes.png

         Thus delocalization of electrons by resonance in aryl halides, calls extra double bond and stability character between

C-X bond. This makes the bond stronger and shorter than perfect single bond. However under various situations the following nucleophilic substitution reactions are observed,

         (i) Nucleophilic displacement :

            725_chemical properties of haloarenes1.png

         (ii) Electrophilic aromatic substitution 

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         (iii) Wurtz - fittig reaction :

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         (iv) Formation of grignard reagent :

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         (v) Ullmann reaction

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