Consequences of Substitution of a  H  with a Functional Group
   ...Linking STRUCTURE,  EMERGENT PROPERTIES, and  BIOLOGICAL ACTIVITY ?
  
      
        Ethane                  CH3-CH3                 toxic, flammable gas
 
        Ethanol                 CH3-CH2-OH          ethyl alcohol, a potable drink
 
        Propionic acid       CH3-CH2-COOH     colorless, corrosive liquid with a pungent odor
 
        Ethyl mercaptan   CH3-CH2-SH        "rotten eggs" - the smell of natural gas
 
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              Last Update - 01 February, 2011