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Since the 1913 edition of Webster's dictionary, the nomenclature of hydrocarbons has become more specific in regards to structure. Hexane is now specifically a string of six linked carbon atoms, like so:

  H H H H H H
  | | | | | |
  | | | | | |
  H H H H H H
Other forms of C6H14 are not considered hexane, but are identified by naming the longest string of carbon atoms, then referencing the branches off of them, as in 2-methyl-pentane, below:
  H H H H H
  | | | | |
  | | | | |
  H | H H H

Hex"ane (?), n. [Gr. six.] Chem.

Any one of five hydrocarbons, C6H14, of the paraffin series. They are colorless, volatile liquids, and are so called because the molecule has six carbon atoms.


© Webster 1913.

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