In $N_2$ molecule,the atoms are bonded by

Which of the following statements is not correct?

Which of the following represents the nodal plane in the $\pi$-bond of ethene $(C_2H_4)$?

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

Distinguish between a sigma and a pi bond.

Which of the following molecules possesses a bond formed by $sp^2-sp$ orbital overlap?