Question #b497b

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Question #b497b

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Answer 1 · 2014-01-27T20:52:18

To count sigma and pi bonds, first you need to know how many single, double and triple bonds are present in the molecule.

Explanation:

A single bond contains one sigma bond (direct head-on overlap of orbitals).

www.chem1.com

For example, the $C-C$ $"C-C"$ sigma bond in ethane is formed by the head-on overlap of two $s p^{3}$ $sp^3$ orbitals. The C-H sigma bonds are formed by $s - s p^{3}$ $s"-"sp^3$ overlap.

A double bond contains one sigma bond and one pi bond (side-on overlap of $p$ $p$ orbitals).

wps.prenhall.com

In ethylene, the $C=C$ $"C=C"$ double bond consists of a sigma bond and a pi bond. The sigma bond is formed by the head-on overlap of two $s p^{2}$ $sp^2$ orbitals. The pi bond is formed by the side-on overlap of two $2 p$ $2p$ orbitals.

A triple bond contains one sigma bond and 2 pi bonds.

www2.chemistry.msu.edu

In acetylene, the $C\equivC$ $"C≡C"$ triple bond consists of a sigma bond and two pi bonds. The sigma bond is formed by the head-on overlap of two $s p$ $sp$ orbitals. The pi bonds are formed by the side-on overlap of $2 p$ $2p$ orbitals.

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Question #b497b

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