state any four drawbacks of lewis approach on covalent bond.
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Answer: Four drawbacks are mentioned below:-
Explanation: Lewis concept fails to explain: (i) The cause of covalent bond formation. (ii) The nature of attractive forces between the constituent atoms of a molecule. (iv) The formation of molecules such as PCl5, SF6 and IF7 in which the central atom has more than 8 electrons in its valence shell (violation of octet rule).
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