Physical properties of organic compound

Topics: Oxygen, Functional group, Alcohol Pages: 1 (415 words) Published: March 5, 2015
Physical properties of organic compound

Low boiling point group: alkane, alkene, alkyne and ether
Boiling point is the exact temperature that the state of compound change from liquid to gas, which need to break the intermolecular forces. The stronger the intermolecular forces, the higher the boiling point. Since straight chain alkane, alkene and alkyne only experience dispersion forces, the compound with more carbons have higher boiling point as more carbons contribute more forces. Branched chain alkanes have lower boiling point than the straight chain alkanes because the branched alkane have a shorter chain length, which makes it pack not as close as straight alkane. For ether, it has one oxygen; there are polar bonds. However, since the functional group is R-O-R’,for oxygen the VSEPER shape is linear so that the polarity canceled out. The compound is still non-polar, and there is only dispersion force. Ether has higher boiling point than alkane, alkene and alkyne because oxygen has higher electron negativity. Cis and Trans: cis usually have higher boiling point because the side chain may have dipole (polar bond) which makes the molecule experience dipole-dipole forces; Trans also have polar bond, but due to its structure, the polarity may canceled out. Alkane
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