Properties of Alkanes, Physical Properties of Alkanes, Chemical Properties, Alkane՚s List (For CBSE, ICSE, IAS, NET, NRA 2022)

Doorsteptutor material for competitive exams is prepared by world's top subject experts: get questions, notes, tests, video lectures and more- for all subjects of your exam.

Physical Properties of Alkenes

  • Alkenes contain a carbon-carbon double bond which changes the physical properties of alkenes. Alkenes are unsaturated carbon compounds which have a general formula of . These compounds are also known as olefins.
  • Alkenes are a family of compounds containing hydrogen and carbon only (hydrocarbons) with a carbon-carbon double bond. Ethene and Propene are the first two hydrocarbons.
Physical Properties of Alkenes

Physical State

  • These double-bonded compounds are colourless and odourless in nature.
  • However, ethene is an exception because it is a colourless gas but has a faintly sweet odour.
  • The first three members of the alkene group are gaseous in nature, the next fourteen members are liquids and the remaining alkenes are solids.

Solubility

  • The alkenes are insoluble in water due to their nonpolar characteristics.
  • But are completely soluble in nonpolar solvents such as benzene, ligroin, etc.

Boiling Point

  • The boiling points of the compounds increase as the number of carbon atoms in the compound increases.
  • When alkenes are compared with alkanes, it is found that the boiling points of both are almost similar, as if the compounds are made up of the same carbon skeleton.
  • The boiling point of straight-chain alkenes is more that branched-chain alkenes just as in alkanes.

Melting Point

  • The melting points of these double-bonded compounds depend upon the positioning of the molecules.
  • The melting point of alkenes is similar to that of alkanes.
  • However, cis-isomer molecules have a lower melting point than trans- isomers as the molecules are packed in a U-bending shape.

Polarity

  • Alkenes are weakly polar just like alkanes but are slightly more reactive than alkanes due to the presence of double bonds.
  • The electrons which make up the double bonds can easily be removed or added as they are weakly held.
  • Hence, the dipole moments exhibited by alkenes are more than alkanes.
  • The polarity depends upon the functional group attached to the compounds and the chemical structures.

Alkane՚s List

Alkane՚s List
List of AlkanesMolecular FormulaStructure
Methane
Types of Methane
Ethane
Types of Ethane
Propane
Types of Propane
Butane
Types of Butane
Hexane
Types of Hexane
Heptane
Types of Heptane
Octane
Types of Octane
Nonane
Types of Nonane
Decane
Types of Decane

Developed by: