O R G A N I C : Aryl Halide

I've presented this topic in front of the class guys. i'm sure it was not a successfull presentation. but now i want to explain in this site



aryl halides are compounds containing halogen attached directly in its aromatic ring. see, benzene which is its one or more hydrogen atoms are replaced by halogen. here I give you some example

m-chloronitrobenzene

bromobenzene

 here I give some physical properties of this compound:^^ if there is only one halogen subtituent, this compound is colorless liquid at room temperature, but if it has two or more halogen subtituent, it is at solid phase at room temperature.^^ each aryl halide compound has different odor^^ aryl halide doesn't dissolve in water and sulfuric acid, but it can be dissolved in organic solvent such as alcohol, ether^^ para isomer has higher melting point than meta and ortho isomer because of its intracrystalline forces (to be honest, I'm still confused how it can be) 

for chemical properties, aryl halide is inert toward nucleophilic substitution at normal condition. but at high temperature and high pressure, this reaction can be occured follow this equation:

C₆H₅X +   Nu >> C₆H₅Nu + X


on the contrary, aryl halide is reactive toward electrophilic subtitution and give para and meta isomer :

Aryl halide can be prepared by halogenation toward benzene, diazonium salt synthetis and sandmayer reaction