Question

Which orbitals can overlap to form a sigma bond and which orbital can do so to form a pi bond

Answer 1

Sigma, pi and delta denote how many planar nodes are in the bond. Sigma bonds have no node, pi bonds have one and delta bonds have two. You can tell what kind of bond forms by how the orbitals overlap. Two single lobes form a sigma bond, two pairs of lobes form a pi bond and two quartets form a delta bond.

#BeBrainly

Answer 2

Sigma bonds are formed when overlapping takes place in two orbitals of internuclear axis(headon overlapping), while pie bonds are formed when orbitals overlap side by side(other then internuclear axis)..

Hope you find it a simple explanation...