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What is the total number of sigma and pi...

What is the total number of sigma and pi bonds in the following molecules?
a. `C_(2)H_(2)` , b. `C_(2)H_(4)`

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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-bond and one sigma bond.
Structure of `C_(2)H_(2)` can be represented as :

Hence, there are three sigma and two pi- bond in `C_(2)H_(2)`
The structure of `C_(2)H_(4)` can be represented as :

Hence, there are five sigma bonds and one pi-bond in `C_(2)H_(4)`.
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NCERT-CHEMICAL BONDING AND MOLECULAR STRUCTURE-EXERCISE
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  7. Draw diagrams showing the formation of a double bond and a triple bond...

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  8. What is the total number of sigma and pi bonds in the following molecu...

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  9. Considering X axis as the inter nuclear axis, which out of the followi...

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  10. Which hybrid orbitals are used by carbon atoms in the following molecu...

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  11. What do you understand by bond pairs and lone pairs of electrons? Illu...

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  12. Distinguish between a sigma and a pi bond.

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  18. Describe the hydribisation in case of PCl(5). Why are the axial bonds ...

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  19. Define hydrogen bond. Is it weaker or stronger than the van der Waals ...

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