Question

Considering $x$-axis as the internuclear axis, which out of the following will not form a sigma bond.

• A. $1s$ and $1s$
• B. $1s$ and $ 2{{p}_{x}} $
• C. $ 2{{p}_{y}} $ and $ 2{{p}_{y}} $
• D. $1s$ and $2s$

Answer 1

Answer: (C)

$ 2{{p}_{y}} $ and $ 2{{p}_{y}} $ will not form a $ \sigma - $ bond because on taking x-axis as internuclear axis $ 2{{p}_{y}} $ and $ 2{{p}_{y}} $ orbitals overlap sideway (lateral overlapping) resulting in the formation of a $ \pi - $ bond.