Which of the following is an electron deficie | vedclass

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Question

(B) An electron-deficient molecule is one in which the central atom has fewer than $8$ electrons in its valence shell,or the total number of valence e

Vedclass · Accepted Answer

$B_2H_6$

Vedclass · Answer

(B) An electron-deficient molecule is one in which the central atom has fewer than $8$ electrons in its valence shell,or the total number of valence electrons is insufficient to form standard two-center two-electron $(2c-2e)$ bonds for all atoms.In $B_2H_6$ (diborane),each boron atom is bonded to two terminal hydrogen atoms by normal $2c-2e$ covalent bonds. The two boron atoms are linked by two bridging hydrogen atoms,forming two $3c-2e$ (three-center two-electron) bonds. Because of these $3c-2e$ bonds,the molecule is electron-deficient.$LiH$ is an ionic hydride,$LiBH_4$ contains the $BH_4^-$ ion (which is electron-precise),and $B_3N_3H_6$ (borazine) is an electron-precise molecule.Therefore,option $B$ is correct.

Which of the following is an electron deficient molecule?

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