Supply the missing alkyl halide reactant in the elimination reactions shown below. 
Definitions:
Buffer
A solution or substance that minimizes changes in pH by absorbing or releasing hydrogen ions.
Acidic
Describes substances with a pH less than 7, characterized by a higher concentration of hydrogen ions.
Neutralize
To render something harmless by applying an opposite force or effect, such as neutralizing an acid with a base.
Denature
The process by which a protein loses its three-dimensional structure due to external stress or compounds, affecting its functionality.
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