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State the drawbacks of Lewis theory?

1. Lewis concept gives thegeneralidea and includes all the coordination reactions and coordination compounds. This may not be true always.. Lewis concept no don explain the behavior of well known protonic acids like HCl, H2SO4, etc. which do not form coordination bonds with bases,according to Lewis, these are not regardeas acids.3. Relative strengths of acids and bases are not explained by Lewis.

4. Many Lewis acids do not possess catalytic property.

5. Lewis Concept does not fit in the acid-base reactionconcept.

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1. This theory can not explain the strength of acids and bases.

2. Generally neutralisation reactions are instantaneous (very fast) but Lewis acid base reaction go slowly.
3. All acid base reactions do not involve co.ordinate bond formation.
4. H+ ion as a catalyst (in some reactions) can not be explained by this theory.

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1.octet rule is not applicable for molecules contain odd electron 2. Octet rule is not applicable for the molecules in which the central atom has less than eight electron that is contracted octet 3. Lewis theory does not explain about shape of molecules 4. It also does not explain about relative stability of the molecules as well as the energies of the molecules
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