Hydrocarbons in Organic Chemistry


Hydrocarbons are compounds containing hydrogen and carbon only. Hydrocarbons are classified as;
  • Saturated hydrocarbons. These are the ones that contain carbon-carbon single bonds. They only contain covalent sigma bonds.
  • Unsaturated hydrocarbons. These contain multiple carbon-carbon bonds and these bonds contain both sigma bonds and pie bonds. Examples include alkenes like ethene and alkynes like ethyne.
Further classification include the following;
  • Aliphatic hydrocarbons. These are the hydrocarbons which contain low carbon-carbon ratio. When they are burnt, they produce no shoot (non-sooty).
  • Aromatic hydrocarbons. These hydrocarbons contain high carbon-hydrogen ratio. When burnt, aromatic hydrocarbons burn with sooty flame. Examples of aromatic hydrocarbons include benzene and naphthalene.


  • Alicyclic hydrocarbons. These are hydrocarbons which which are hydrocarbons in which carbon atoms are arranged in the ring other than benzene ring. These compounds can be saturated meaning they have only sigma bonds or they can be unsaturated with both sigma and pie bonds. For example, cyclohexane, cyclopentene, cyclobutene and cyclopropane.
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