Fri December 16, 2011 By:

dear sir, where would i get information and explanation on some characte characteristic f features on pi bonds to answer questions on how many sigma and pi bonds are present in some hydrocarbon molecules.

Expert Reply
Sat December 17, 2011
For every single bond, you have one “sigma” bond.
If you have a double bond, you have one “sigma” bond and one “pi” bond.
If you have a triple bond, you have 1 sigma bond and two pi bonds.

So to find the total number of pi bonds in the molecule, you need to identify the number of double and triple bonds in the molecule.
No. of pi bonds = (No. double bonds) + (2 * No. of triple bonds)

It would help to draw out the structure with the appropriate bonds between the atoms.
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