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Intermolecular forces in Aldehydes and Alkanes

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    Since, propane is symmetrical it is a non-polar molecule therefore it only has VDW forces. However, how do we determine that aldehydes have permanent dipole dipole forces?

    Thanks
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    (Original post by xXxiKillxXx)


    Since, propane is symmetrical it is a non-polar molecule therefore it only has VDW forces. However, how do we determine that aldehydes have permanent dipole dipole forces?

    Thanks
    Ethanal molecules have a polar C=O bond, so are polar molecules. The oxygen atom always have a high electron density, so the molecules will have London Forces and permanent dipole-dipole forces.
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    (Original post by NutterFrutter)
    Ethanal molecules have a polar C=O bond, so are polar molecules. The oxygen atom always have a high electron density, so the molecules will have London Forces and permanent dipole-dipole forces.
    Thank you, so every aldehyde is polar (since every aldehyde contains a polar C=O bond)? Also, when writing the condensed structural formula for an alkene, can you leave out the double bond as below:

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