Using a potential energy diagram,explain/illustrate the preferential formation of the 3 substituted product instead of the 2 or 4 product in the electrophilic aromatic substitution of pyridine. 
Definitions:
Average Variable Cost
The variable cost of production divided by the quantity of output, representing the cost of labor and materials per unit of production.
Economic Profit
The difference between the total revenue generated by a business and the total costs, both explicit and implicit.
Total Fixed Costs
Expenses that do not change with the level of production or sales, such as rent, salaries, and insurance premiums, over a certain period of time.
Profit-Maximizing
The process or strategy of adjusting production and operations to generate the highest possible profit.
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