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Question: Boron cannot form which one of the following anions?...

Boron cannot form which one of the following anions?

A

BF63–

B

BH4–

C

B(OH)4–

D

BO2–

Answer

BF63–

Explanation

Solution

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