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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$B_{2}H_{6}$

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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 $B_{2}H_{6}$ (diborane),boron has only $6$ electrons in its valence shell in the terminal $B-H$ bonds and participates in $3$-center-$2$-electron $(3c-2e)$ bonds (banana bonds).Therefore,$B_{2}H_{6}$ is an electron-deficient molecule.

Which of the following molecules is electron-deficient?

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