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+2 votes
in Chemistry by (29.8k points)
What is the total number of sigma and pi bonds in the following molecules? (a) C2H2 (b) C2H4

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+1 vote
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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: 

+1 vote
by (2.4k points)
In(1) sigma=3 π=2

In(2) sigma=5 π=1

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