Which of the following overlapping is not possible if z is i... | Chemistry - Valence Bond Theory (VBT) and Types of Overlapping and Bonds (Sigma, Pi, Delta) | SolveeIt

Which of the following overlapping is not possible if z is internuclear axis :-

( $s + p_x$ )

$p_z + d_{yz}$

$s + d_{x^2-y^2}$

$p_z + p_z$

Answer

(A), (B), (C)

Explanation

Overlap is possible only if orbitals have compatible symmetry with respect to the internuclear axis. For z as internuclear axis:

(A) s + p_x: s is symmetric, p_x is antisymmetric w.r.t. yz-plane (containing z-axis). Overlap is zero. Not possible.
(B) p_z + d_yz: p_z is symmetric, d_yz is antisymmetric w.r.t. xz-plane (containing z-axis). Overlap is zero. Not possible.
(C) s + d_x^2-y^2: s is symmetric, d_x^2-y^2 has lobes in xy-plane. Overlap is zero due to cancellation of positive and negative overlaps. Not possible.
(D) p_z + p_z: Forms a sigma bond. Possible.

Question: Which of the following overlapping is not possible if z is internuclear axis :-...