Question

Dative bonds are not present in:

• A. $A{l}_{2}C{l}_6$
• B. $B{F}_3$
• C. Borazole
• D. $B_2{H}_6$

Answer 1

The correct option is D $B_2{H}_6$

$AlC{l}_3$ exists as a dimer ${Al}_{2}C{l}_6$.The bonding between two molecules of $AlC{l}_3$ is coordinate bonding.

In $B{F}_3$, boron has incomplete octet so it forms a coordinate bond with $N{H}_3$.

B-N bond in Borazole is dative bond arises from the sideways overlap between filled orbital of N-atom and empty p-orbitals of B-atom.

Diborane has three centers two electron bonding.