If the z-axis is internucleus axis, which of the following orbital can't form $δ -$ bond?

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All can form

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

$d_{x y}$

$d_{z^{2}}$

answer is A.

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Detailed Solution

The $δ -$ bond, is only generated by the face-to-face overlap of two parallel d orbitals and has a very different symmetry from the other two types of bonds with regard to the internuclear axis

The parameters for forming a delta bond are not satisfied by the $d_{z^{2}}$ orbital.
Thus, the $d_{z^{2}}$ orbital cannot form the $δ -$ bond.

Hence, the option A is correct.

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