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How to tell if a molecule has π bonds or σ bonds?

Is there any telltale way to find out just from look at the molecule structure?
For example, I know that C double bond C has both pi and sigma bonds, but how would I know that by just looking at that structure?

Yes!

Single bond: 1 σ bond
Double bond: 1 σ bond and 1 π bond
Triple bond: 1 σ bond and 2 π bonds

The information above is true for covalent bonds.

This entry was posted on Sunday, January 31st, 2010 at 11:01 am and is filed under bonds. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

2 Responses to “How to tell if a molecule has π bonds or σ bonds?”

  1. Billy B says:
    January 31, 2010 at 4:42 pm

    Yes!

    Single bond: 1 σ bond
    Double bond: 1 σ bond and 1 π bond
    Triple bond: 1 σ bond and 2 π bonds

    The information above is true for covalent bonds.
    References :

  2. Joe says:
    January 31, 2010 at 4:48 pm

    So very simple…look at the examples:

    A molecule with a SINGLE bond has a sigma bond (σ) because the sigma bond is always the first to form. Example: H3C – CH3

    A molecule with a DOUBLE bond has 1 sigma bond a 1 pi bond (π). Example: H2C=CH2

    A molecule with a TRIPLE bond has 1 sigma bond and 2 pi bonds.
    References :

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