Question -
Answer -
A single bond is a resultof the axial overlap of bonding orbitals. Hence, it contributes a sigma bond. Amultiple bond (double or triple bond) is always formed as a result of thesidewise overlap of orbitals. A pi-bond is always present in it. A triple bondis a combination of two pi-bonds and one sigma bond.
Structure of C2H2 can be representedas:
Hence, there are three sigma and twopi-bonds in C2H2.
The structure of C2H4 can be representedas:
Hence,there are five sigma bonds and one pi-bond in C2H4.