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Considering x-axis as the internuclear a...

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 `2p_(x)` (c) `2p_(y)` and `2p_(y)` (d) 1s and 2s.

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( c) will not form a `sigma` bond because taking x-axis as the internuclear axis, there will be side way (lateral) overlap between the two `2p_(y)` orbitals forming a `pi`-bond as shwn below: In
a. `sigma`-bond is formed:

b. `sigma`-bond is formed:
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