Consider the tetracyclic aromatic compound drawn below,with rings labelled as I,II,III,and IV.Which of the four rings is most reactive in electrophilic aromatic substitution? 
Definitions:
Nutrient Cycling
The movement and exchange of organic and inorganic matter back into the production of living matter, recycling elements and nutrients through the biosphere.
Hydroelectricity
The production of electricity using the energy generated from flowing or falling water, typically through dams.
Photosynthesis
The process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water, releasing oxygen as a byproduct.
Euphotic Zone
The layer of a body of water that is sufficiently lit by sunlight, allowing photosynthesis to occur.
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