Why the bond energy is not defined for liquid and solids,please explain in detail
I found this on Google but not as a url. Here it is.
"Why are bond energies for gases only? Of course, bond energies exist for liquids and solids. But we measure it for gas only, because there there is no influence from the solvent. ... Molecules of different gases have equal average kinetic energies provided their temp is the same."
You can Google your question and get a page of references. I suggest you do so.