question_answer

Among the following ions the \[p\pi -d\pi \] overlap could be present in:                    [AIPMT 2000]

A) \[NO_{2}^{-}\]

B) \[NO_{3}^{-}\]

C) \[PO_{4}^{3-}\]

D) \[CO_{3}^{2-}\]

Correct Answer: C

Solution :

[c] In \[P-O\] bond, it bond is formed by the sidewise overlapping of d-orbital of P and p-orbital of oxygen. Hence, it is formed by \[p\pi -d\pi \] overlapping.

In nitrogen and carbon no vacant d-orbital is present. So, they do not form \[p\pi -d\pi \] bond