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Branching starts from hydrocarbons with 4 carbon atoms.

               Example-
               1.  Butane - C H : [Two isomers]
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                  Common Name- n-butane                                   Common Name- Iso - butane
                  IUPAC Name- Butane                                 IUPAC Name- 2-methyl, propane.






























               2.  Pentane – C H  :  [Three isomers]
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               Common Names of Pentane-










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