Which of the following species does NOT contain any d - p bond?

Step-by-step solution

To determine the type of bonds present, we must look at the valence shell of the central atom. In NO ₃⁻ , the central atom is nitrogen, which belongs to the second period. Nitrogen has the valence shell electron configuration 2 s ^2 2 p ^3 and lacks vacant d-orbitals. Therefore, it can only form p - p multiple bonds with oxygen. In SO ₂ and SO ₃ , the central atom is sulphur (third period), which has vacant 3d-orbitals. When sulphur expands its octet to form multiple bonds with oxygen, it utilizes these d-orbitals,