Distinguish between a sigma and a pi bond.
The following are the differences between sigma and pi-bonds:
Sigma (σ) Bond |
Pi (π) Bond |
(a) It is formed by the end to end overlap of orbitals. |
It is formed by the lateral overlap of orbitals. |
(b) The orbitals involved in the overlapping are s–s, s–p, or p–p. |
These bonds are formed by the overlap of p–p orbitals only. |
(c) It is a strong bond. |
It is weak bond. |
(d) The electron cloud is symmetrical about the line joining the two nuclei. |
The electron cloud is not symmetrical. |
(e) It consists of one electron cloud, which is symmetrical about the internuclear axis. |
There are two electron clouds lying above and below the plane of the atomic nuclei. |
(f) Free rotation about σ bonds is possible. |
Rotation is restricted in case of pi-bonds. |