If the internuclear axis is the z-axis,then i | vedclass

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(A) For the $z$-axis as the internuclear axis:$1$. $p_z + p_z$ orbitals overlap head-on to form a $\sigma$-bond.$2$. $p_y + p_y$ orbitals overlap late

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$d_{xy} + d_{xz}$

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(A) For the $z$-axis as the internuclear axis:$1$. $p_z + p_z$ orbitals overlap head-on to form a $\sigma$-bond.$2$. $p_y + p_y$ orbitals overlap laterally to form a $\pi$-bond.$3$. $d_{z^2} + d_{z^2}$ orbitals overlap head-on to form a $\sigma$-bond.$4$. $d_{xy} + d_{xz}$ orbitals do not have the correct symmetry for effective overlap along the $z$-axis,hence no $\sigma$ or $\pi$ bond is formed.

If the internuclear axis is the $z$-axis,then in which of the following cases are $\sigma$ and $\pi$ bonds not possible?

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