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

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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.

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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.