Question

In which of the following molecules/species, all following characteristics are found?
(a) Tetrahedral hybridisation.
(b) Hybridisation can be considered to have taken place with the help of empty orbital(s).
(c) All bond lengths are identical, i.e., all $A-B$ bond lengths are identical.

• A. $B_4{H}_6$
• B. $A{l}_{2}C{l}_6$
• C. $BeC{l}_2\left(g\right)$
• D. ${B{F}_4}^{-}$

Answer 1

The correct option is D ${B{F}_4}^{-}$

In ${B{F}_4}^{-}$ ion, all following characteristics are found.
(a) Tetrahedral hybridisation which is $s{p}^3$ hybridization due to the presence of $4$ bond pairs of electrons and zero lone pairs of electrons..
(b) Hybridisation can be considered to have taken place with the help of empty orbital. $B$ contains $3$ valence electrons, whereas $4$ orbitals participate in the hybridization. Thus, one empty orbital participates in the hybridization.
(c) All bond lengths are identical, i.e., all $A-B$ bond lengths are identical as there are four identical $B-F$ single bonds.