Which pair of the following compounds are constitutional isomers? 
Definitions:
Marginal Cost
An increase in the full cost that comes from producing an additional unit of a product or service.
Monopolistic Competition
A market structure characterized by many firms selling products that are substitutes but not perfect substitutes, leading to each firm having some market power.
Perfect Competition
A market structure characterized by an infinite number of small firms, identical products, and easy market entry and exit, leading to companies not having pricing power.
Monopolistic Competition
A market structure characterized by many firms selling products that are similar but not identical, allowing for some differentiation and price control.
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