Boron cannot form which one of the following anions?

Question:

Boron cannot form which one of the following anions?

  1. $\mathrm{B}(\mathrm{OH})_{4}^{-}$

  2. $\mathrm{BO}_{2}^{-}$

  3. $\mathrm{BF}_{6}^{3-}$

  4. $\mathrm{BH}_{4}^{-}$


Correct Option: , 3

Solution:

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