1. I has been very successful in the treatment of the effect of group of para and meta position . It has also been in attempt to apply it to ortho position.
2. σ- determines the effect of Substituents and rho determones the sensitivity of the reactions.
3. Hammett e equation may be applied to many physical measurement including infrared frequency and NMR chemical shift.
4. It is successful to explain whether the substrate is attacked by electrophilic, nuclephilic or free radical reagent.
5. σ and rho value are also applicable for the prediction of electrophilic situation on reaction center,
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