Which of the following has pπ – dπ bonding ? (a) NO (b) SO (c) BO (d) CO

The p d bonding is possible in the compounds which can expand its octet to d-orbital. Therefore, we need to see the electronic configuration of the central elements- 2 2 3 2 2 6 2 4 2 2 1 2 2 2 1 2 2 1 2 2 3 3 1 2 2 1 2 2 N s s p S s s p s p B s s p C s s p Here, it can be seen that only sulfur belongs to 3rd period and can expand its octet to d-orbital. Thus, the correct option is-(b)