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A sigma bond is the end-to-end overlap of the bonding orbitals, usually hybrid orbitals. The sigma bond is a single bond. A pi bond is the side-to-side overlap of unhybridized p-orbitals. A pi bond, along with a sigma bond form a double bond. sigma bond is used in hybridization but pi bond when dealing with saturated molecules is not used,that is double bonds.The oygen molecule is sp hybridized have you ever reasoned or found out why.
To count sigma and pi bonds, first you need to know how many single, double and triple bonds are present in the molecule. A single bond contains one sigma bond (direct head-on overlap of orbitals). www.chem.ucla.edu For example, the C-C sigma bond in ethane is formed by the head-on overlap of two spÂ³ orbitals.