Question

Boron does not form (BF6)3- ion. Explain why ?

Answer 1

Boron does not have d orbital in its valence shell.
Hence, Maximum covalency of boron can not exceed 4.
Thus, Boron is unstable to form (BF6)3-

Answer 2

$\huge\boxed{\underline{\mathcal{\red{A}\green{N}\pink{S}\orange{W}\blue{E}\purple{R}}}}$

❤⭐ :REASON:⭐❤

• ❤.. Due to $\red{\tt{Non}}$_$\purple{\tt{availability}}$ of$\orange{\tt{d}}$ orbitals,boran is unable to expand its$\green{\tt{Octet}}$.
• ❤...Therefore,the maximum cobalence of boran cannot exceed4.