Which of the following is an electron-deficie | vedclass

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Question

(A) An electron-deficient molecule is one in which the central atom has fewer than $8$ electrons in its valence shell,or it lacks sufficient electrons

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$B_2H_6$

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(A) An electron-deficient molecule is one in which the central atom has fewer than $8$ electrons in its valence shell,or it lacks sufficient electrons to form conventional covalent bonds.In $B_2H_6$ (diborane),each boron atom is bonded to four hydrogen atoms,but there are only $12$ valence electrons available for the entire molecule,which is insufficient to form standard two-center-two-electron $(2c-2e)$ bonds for all linkages.It contains two $3$-center-$2$-electron $(3c-2e)$ bonds,also known as banana bonds,making it an electron-deficient molecule.In contrast,$C_2H_6$,$PH_3$,and $SiH_4$ are electron-precise molecules where the octet rule is satisfied for the central atoms.

Which of the following is an electron-deficient molecule?

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