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Question 29

Considering x-axis as the internuclear axis which out of the following will not form a sigma bond and why?

(a) 1s and 1s

(b) 1s and 2px

(c) 2py and 2py

(d) 1s and 2s.

Answer

Sigma bond is always formed between two half filled atomic orbitals along their INTERNUCLEAR AXIS ,i.e the line joining the centers of the nuclei of two atoms(axial overlapping).

From the given data if we consider x axis as the internuclear axis 2py and 2py overlapping is not possible as both the 2py orbital will lie on y axis.While the other 1s,2s,2px all lie on X axis internuclear axis.

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