Question

In case of sp³d hybridization, if all the sigma bonds are identical then how many lone pair must be present

Answer 1

In AB₂​L₃​ type molecule, where there are 2 bonds pairs which leads to the formation of sigma bonds and are identical and it has three lone pair of electrons. The hybridization is sp³d. Its electron geometry is trigonal bipyramidal and molecular shape is linear. Its structure is shown as:
Example: I₃⁻​, Br₃⁻​ etc.