Complete the following reaction sequence,giving structural details of all key intermediates: 
Definitions:
Marginal Benefits
The additional benefits or advantages gained from an increase in an activity or the consumption of a good or service.
Flood-Control Projects
Initiatives and constructions undertaken to manage and prevent flooding in vulnerable areas, typically involving barriers, dams, and water diversion systems.
Spillovers
Refers to the impact that an economic activity has on unrelated third parties, which can be either positive or negative.
Marginal Cost
The financial outlay required to produce one more unit of a product or service.
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