If z axis is the molecular axis then correct matching for $d_{xy} + d_{xy}$ orbital is 4, P, II for the substraction of wave function.
Which of the following matching is correct for the addition of wave function for same combination of orbitals.

Question

If z axis is the molecular axis then correct matching for $d_{xy} + d_{xy}$ orbital is 4, P, II for the substraction of wave function.

Which of the following matching is correct for the addition of wave function for same combination of orbitals.

TestHub · Accepted Answer

Orbital Type: The face-to-face addition ( $d_{x y} + d_{x y}$ ) along the z-axis results in a $δ$ -bonding molecular orbital (BMO).

Symmetry: Since both atomic $d_{x y}$ orbitals are centrosymmetric (gerade), their constructive addition forms a molecular orbital that is also symmetric under inversion (gerade, Column-III $\to$ I).

Nodal Planes: The orbital retains only the two original perpendicular nodal planes ( $x z$ and $yz$ planes) of the $d_{x y}$ orbital, meaning it has 2 nodal planes (List-II $\to$ Q).

Conclusion: Combining these gives Q, I, which matches option (D).

List - I (Molecular orbital)	List - II (Number of nodal planes)	Column-III (Characteristics of molecular orbital)
(1) $σ_{s}$	(P) 3	(I) BMO, gerade
(2) $π_{p}$	(Q) 2	(II) ABMO, ungerade
(3) $σ_{p_{z}}^{*}$	(R) 1	(III) BMO, ungerade
(4) $δ^{*}$	(S) 0	(IV) ABMO, gerade

Chemistry - CHEMICAL BONDING Question with Solution | TestHub

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