Consider the following structures I-IV.Which two species represent a conjugate acid-base pair? 
Definitions:
Kinetic Control
A condition in which the rate at which reactants are converted into products determines the predominant product, influenced by factors like temperature and reaction time.
HBr
A corrosive, gaseous compound used in the production of inorganic and organic bromine compounds and as a catalyst in some types of chemical reactions.
Dienes
Organic compounds containing two double bonds, which may vary in their arrangements and contribute to the compound's reactivity, particularly in polymerization and Diels-Alder reactions.
Major Product
The product of a chemical reaction that is formed in the greatest quantity, as determined by the reaction conditions and mechanism.
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