A chemical bond in general may be defined as the force of attraction that binds the constituent particles (i.e. atoms or molecules or ions) together in various chemical species. The concept of covalent bond formation based on sharing of electrons was a purely qualitative approach. In order to offer a reasonable explanation the modern researchers, based on wave mechanics, proposed two theories which are:

(i)         Valence Bond Theory (VBT)

(ii)       Molecular Orbital Theory (MOT)

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