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In organic chemistry sigma bonds (Ï) are always the first bond between two atoms, resulting from overlap along the bonding axis (of hybrid orbitals), while pi bonds (Ï) are second and third bonds resulting from the overlap of p orbitals, above and below (or in front and back of) the bonding axis.
1. Sigma Bond: A single bond is formed between two atoms by overlapping of orbitals along the same axis is known as sigma bond e.g. formation of bonding shown below: Since in such system maximum overlapping is possible hence bond is strong bond.