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Question:

Boron cannot form which one of the following anions?

B(OH)₄⁻

BH₄⁻

BO₃³⁻

BF₄⁻

Solution:

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 B(OH)₄⁻.