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Physical Properties Of Alkenes

The first three alkenes are gases, the next fourteen members are liquids and the higher ones are solids. They are colourless and odourless (except ethylene which has a faint sweet smell), practically insoluble in water but fairly insoluble in non-polar solvents like benzene, petroleum ether, etc. They show a regular gradation in physical properties, such as boiting points, with increasing carbon content. The boiling point of two successive members’of the homologous alkene series differ by about 20-30°C, except for very small homologues. The branched chain alkenes have lower boiling points than the corresponding straight chain alkenes. Like alkanes, alkenes are generally non-polar, but certain alkenes are weakly polar. For example, dipole moment of propene and 1-butene is about 0.35D due to their unsymmetrical geometry.

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