Which of the following molecules is electron- | vedclass

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

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$B_2H_6$

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(D) An electron-deficient molecule is one in which the central atom has fewer than $8$ electrons in its valence shell,or the molecule has fewer electrons than required for conventional Lewis structures.In $B_2H_6$ (diborane),each Boron atom is bonded to three terminal Hydrogen atoms and two bridging Hydrogen atoms.Each Boron atom has only $6$ valence electrons in its bonding environment,making it an electron-deficient molecule (often referred to as a $3$-center-$2$-electron bond system).$C_2H_6$,$SiH_4$,and $PH_3$ all follow the octet rule for their central atoms.

Which of the following molecules is electron-deficient?

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