Question

Considering `X` axis as the internuvlear axis, which out of the following will form a sigma bond
(a) `1s` and `ls` (b) `ls ` and `2p_(x)`
(c ) `2p_(y)` and `2p_(y)` (d) `2p_(x)` and `2p_(y)`
(e) `1s` and `2s` .`

Answer 1

( 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: