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

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

 (a) 1and 1

(b) 1and 2px 

(c) 2py and 2py 

(d) 1and 2s.

Solution:

2py and 2py orbitals will not a form a sigma bond. Taking x-axis as the internuclear axis, 2py and 2py orbitals will undergo lateral overlapping, thereby forming a pi (π) bond.

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