Chemical Bonding and Molecular Structure

d - p bond present in

1. CO32-
2. PO43-
3. NO3-
4. NO2-

Answer

(2) PO43-

Solution

A d - p bond needs vacant d orbitals on the central atom, i.e. an element of the third period or beyond.

C and N (second period) have no d orbitals ⇒ in CO32-, NO3- and NO2- the π bonds are p - p .

P (third period) uses its 3d orbitals ⇒ in PO43- the P=O π bond is d - p (d orbital of P with p orbital of O).

Answer: (2)