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Question
What is the total number of sigma and pi bonds in the following molecules?
C2H2
Solution 1
A single bond is a result of the axial overlap of bonding orbitals. Hence, it contributes a sigma bond. Multiple bonds (double or triple bonds) are 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.
The structure of C2H2 can be represented as:
Hence, there are three sigma and two pi-bonds in C2H2.
Solution 2
H—C = C—H
Sigma bond = 3
π bonds = 2
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