Haloarenes are the chemical compounds containing arenes, where one or more hydrogen atoms bonded to an aromatic ring are replaced with halogens. The nature of C-X bond depends on both the nature of carbon in the aromatic ring and the halogen attached. Halogens are generally denoted by “X”.

Salient points on the nature of C-X bond in haloarenes are:

1.The C-X bond in haloarenes is polarized, as halogens are more electronegative than carbon. Due to high electronegativity of halogen, it attracts the electron cloud more towards itself and thus gains slight negative charge, on the other hand, carbon obtains a slight positive charge.

2.As halogens need only one electron to achieve their nearest noble gas configuration, only one sigma bond is formed between one carbon and one halogen atom.

3 .Due to the increase in atomic size from fluorine to astatine, the C-X bond length in haloarenes increases from fluorine to astatine and bond dissociation strength decreases.