Ncert Exercises & Solutions

4.28 What is the total number of sigma and pi bonds in the following molecules?

(a) C $_{2}$ H $_{2}$ (b) C $_{2}$ H $_{4}$

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:

Hence, there are three sigma and two pi-bonds in C

_{2}

_{2}

.
The structure of C

_{2}

_{2}

can be represented as:

Hence, there are five sigma bonds and one pi-bond in C

_{2}

_{2}

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