Considering the $X$-axis as the internuclear axis,which of the following will not form a sigma $(\sigma)$ bond and why?

Which of the following overlaps is incorrect (assuming $Z$-axis is the internuclear axis)?
$(A)$ $2p_y + 2p_y \to \pi$-bond formation
$(B)$ $2p_x + 2p_x \to \sigma$-bond formation
$(C)$ $3d_{xy} + 3d_{xy} \to \pi$-bond formation
$(D)$ $2s + 2p_y \to \pi$-bond formation
$(E)$ $3d_{xy} + 3d_{xy} \to \delta$-bond formation
$(F)$ $2p_z + 2p_z \to \sigma$-bond formation

The $F_2$ molecule is formed by which of the following?

Which type of orbitals overlap with each other in benzene?

Explain the types of overlapping of atomic orbitals with diagrams.

The strength of bonds formed by $2s-2s$,$2p-2p$ and $2p-2s$ overlap has the order