First slide

Anomalous properties of Boron

Question

Boron cannot form which of the following anions?

Moderate

A

${BF}_{6}^{3 -}$
B

${BH}_{4}^{-}$
C

$B {(OH)}_{4}^{-}$
D

${BO}_{2}^{-}$

Solution

Due to non-availability of d-orbitals, boron cannot expand its octet. Therefore, the maximum covalence of boron cannot exceed 4.

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