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A molecule with a double bond will not always have a higher bowling point then one with more single bonds. This is because the physical properties like boiling and melting points are determined by intermolecular forces not intramolecular forces. Intermolecular forces are bonding forces between molecules/compounds like London forces, dipole-dipole forces, and hydrogen bonding. These bonds are the ones that affect the state of matter a compound is in at a certain temperature and these are affected by things like polarity. Double bonds and single bonds however are examples of intramolecular forces, or forces within a molecule not between them, and these are what we take into consideration when talking about chemical properties since chemical reactions require the breaking of bonds to create new ones.
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