Question

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 1

Answer: (C)

2py and 2py

Answer 2

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 $pi\;(\pi)$ $bond$.

Therefore, the correct option is (C): 2py and 2py