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:
Action Potential
A temporary reversal of electrical polarization of the membrane of a nerve cell or muscle cell, enabling the transmission of signals.
Ions
Electrically charged atoms or molecules formed by the loss or gain of one or more electrons.
Axon Membrane
The lipid bilayer covering an axon of a neuron, which plays a critical role in conducting electrical impulses and communication between neurons.
Glial Cells
Non-neuronal cells in the central nervous system that support, protect, and nourish neurons, playing critical roles in brain function.
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