difference sigma and pi bonds
â¢ Sigma bonds are stronger than pi bonds. â¢ Sigma bonds can be formed between both s and p orbitals whereas pi bonds are mostly formed between p and d orbitals. â¢ The single covalent bonds between atoms are sigma bonds. When there are multiple bonds between atoms, pi bonds can be seen. â¢ pi bonds result in unsaturated molecules. â¢ Sigma bonds allow free rotation of atoms whereas pi bonds restrict the free rotation.