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What are electron deficient compounds explain with example?

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Electron deficient compounds:Compounds wherein the central atom lacks eight electrons in its outer shell or possesses eight electrons but can widen the valency owing to the existence of unoccupied d – orbitals.In brief, electron-deficient compounds lack enough electrons to fulfill the octet of the central atom.Examples:Electron-deficient compounds are those with less than $8$ electrons in their valence shells, such as ${\mathrm{B}}_{2}{\mathrm{F}}_{6},{\mathrm{Al}}_{2}{\mathrm{Cl}}_{6}$, and others.Boron family example of Electron deficient compounds:Boron, for example, with the electronic structure $\left[\mathrm{He}\right]2{\mathrm{s}}^{2}2{\mathrm{p}}^{1},$ creates compounds known as electron-deficient compounds.Boron has just three valence electrons, however, four orbitals are available to house these electrons.Other boron family members, such as Aluminum, Gallium, Indium, and Thallium, have a proclivity to lose valence electrons and generate ionic ${\mathrm{M}}^{3+}$ entities in their compounds.

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