Ncert Exercises & Solutions

4.29 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 $2 p_{x}$ ;

_{y}

and 2p

_{y}

orbitals will not a form a sigma bond. Taking x-axis as the internuclear axis, 2p

_{y}

and 2p

_{y}

orbitals will undergo lateral overlapping, thereby forming a pi (π) bond.