| Sl no | sigma bond (σ) | Pi bond (π) |
| 1. | The bond is formed by the axial overlap of the atomic orbitals. | The bond is formed by the sideway overlap of the atomic orbitals. |
| 2. | Sigma bond is stronger since the extent of overlapping is greater. | Pi bond is weaker since the extent of overlapping is weaker |
| 3. | Sigma bond involves overlap of ss, s-p or p-p orbitals | Pi bond involves the overlap of p-orbitals only |
| 4. | The bond may be present between the two atoms either alone or along with pi bond. | The bond is always present between the two atoms along with a sigma bond |
| 5. | Free rotation of the atoms around σ-bond is possible | Free rotation of the atoms around π-bond is not possible. |
