Hydrocarbon

MUST Remember!
Hydrocarbons are organic compounds that contain only carbon and hydrogen.
Saturated Hydrocarbon
Saturated Hydrocarbon
  1. Hydrocarbon is a compound made out of the elements carbon and hydrogen only.
  2. Examples of hydrocarbon are alkane, alkene and alkyne. 
  3. Hydrocarbon can be divided into two groups:
    1. saturated hydrocarbon
    2. Saturated hydrocarbons are hydrocarbons where all its carbon atoms are tied to each other through single covalent bond only. Examples: alkanes
    3. unsaturated hydrocarbon
    4. Unsaturated hydrocarbons are hydrocarbons which contains at least one double covalent bond among its carbon atoms. Examples: alkenes
    Unsaturated Hydrocarbon
  4. Ethanol ( C2H5OH ), ethanoic acid (CH3COOH), metal methanoat (HCOOCH3), chloromethane (CH3Cl) and others are not hydrocarbons because the molecule contains other elements such as chlorine or oxygen other than carbon and hydrogen.
MUST Know!
  • Saturated - All single bond between carbons 
  • Unsaturate - Has at least one double/triple bond between carbons

Comparing Saturated and Unsaturated Hydrocarbon

Saturated Hydrocarbon Unsaturated Hydrocarbon
Combustion Produce less soot Produce more soot
Reaction with bromine water The brown colour of bromine remain unchanged Decoloarise the brown colour of bromine
Reaction with potassium manganate(VII) solution The purple colour of potassium manganate (VII) solution remain unchanged Decolourise the purple colour of potassium manganate (VII) solution

Sources of Hydrocarbon:

The main sources of hydrocarbons are
  1. Coal
  2. Natural gas
  3. Petroleum

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