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11.9     What are electron deficient compounds ? Are BCl_{3} and SiCl_{4} electron deficient species ? Explain.

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Electron-deficient compounds are those in which the octet of the central atom is not completed. Therefore, the metal wants to complete its octet by accepting an electron from a donor molecule.
BCl_{3} is an electron-deficient compound because of the central atom, Boron has only 6 electrons, two electrons are needed to complete its octet.

SiCl_{4} silicon has 4 valence electrons and by covalent bonding, it gets 4 electrons from four chlorine atom. Hence, SiCl_{4} is not an electron-deficient molecule.

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