Which type of bond is present in $[B e F_{2}]_{n}$ polymer?

3 C - 2 e^{-}

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3 C - 4 e^{-}

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3 C - 3 e^{-}

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None of these

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Solution

The correct option is C $3 C - 4 e^{-}$
$[B e F_{2}]_{n}$ contains $3 C - 4 e^{-}$ bonds.
One $F$ atom and two $B e$ atoms are $3$ centers. The middle $O$ contributes two electrons each to the be atom, thereby a total of $4$ electrons are contributed and it forms $Be−F−Be$ bridges.

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