Elimination reactions are organic reactions that involve creation of a double bond through the elimination of atoms and/or groups of atoms from adjacent carbon atoms.  

Elimination reactions are of various types.

1. Dehydrogenation
   
   Dehydrogenation is the removal of two hydrogen atoms. For example, the following reaction depicts the dehydrogenation of ethane. This reaction, commonly known as ethane cracking, produces ethene or "ethylene". Used to synthesize many hydrocarbon derivatives, ethene is the cornerstone of the Alberta petrochemical industry. 
   
   
   
   
   
   
2. Dehydration   Another example of an elimination reaction involves the removal of a water molecule from an alcohol molecule. This type of elimination reaction is a dehydration.
   
   
   
   
   
   
3. Dehydrohalogenation
   Halogenated hydrocarbons can undergo elimination reactions in the presence of bases.
    
   
   
   
   

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Complete Practice Questions 18, 19, 20 on page 433 of the textbook.

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