Use the definition of a logarithm to prove 
. Hint: Let 
and 
. Then, 
and 
Definitions:
Electrophilic Iodination
A chemical reaction involving the addition of iodine to a substrate via an electrophilic attack.
Aromatic Ring
A stable, planar ring of carbon atoms interconnected by alternating single and double bonds, exhibiting delocalized π-electron cloud.
HNO3
Nitric acid, a highly corrosive and toxic strong acid used in the production of fertilizers, explosives, and in the production of other chemicals.
Reactivity
The inclination of a material to participate in chemical changes, alone or in combination with other elements, leading to the liberation of energy.
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