Boron cannot form which one of the following anions?

B F_{6}^{3 -}

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B H_{4}^{-}

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B (O H)_{4}^{-}

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B O_{2}^{-}

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Solution

The correct option is A $B F_{6}^{3 -}$
The maximum covalency of B is 4. It cannot form 6 bonds because it has no vacant orbital in the outermost orbit.

So, the correct option is A.

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{B F}_{6}^{3 -}

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