Chapter 9.5, Problem 4CP

Which of the following pairs of atomic orbitals on adjacent nuclei can overlap to form a pi bond? Consider the x axis to be the internuclear axis.

$\begin{array}{l}\text{a)}\hfill \\ 1s\text{ and }2s\hfill \\ \text{b)}\hfill \\ 2s\text{ and }2s\hfill \\ \text{c)}\hfill \\ 2p_y\text{ and }2p_y\hfill \\ \text{d)}\hfill \\ 3P_y\text{ and }3p_z\hfill \\ \text{e)}\hfill \\ 2p_x\text{ and }3p_x\hfill \end{array}$