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Draw the structure of C2H4 and C2H2 also write the no. of sigma and pi bonds.

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A single bond is a result of the axial overlap of bonding orbitals. Hence, it contributes a sigma bond. A multiple bond (double or triple bond) is always formed as a result of the sidewise overlap of orbitals. A pi-bond is always present in it. A triple bond is a combination of two pi-bonds and one sigma bond. Structure of C2H2 can be represented as: 

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