Consider the tetracyclic aromatic compound drawn below,with rings labelled as I,II,III,and IV.Which of the four rings is least reactive in electrophilic aromatic substitution? 
Definitions:
Cash Cycle
The period between the outlay of cash for raw materials and receiving cash from customer payments, essentially measuring the time it takes for a company to turn its inventory into cash.
Compensating Balance
A minimum account balance that a borrower must maintain in a bank as a condition for obtaining a loan, often used to offset a portion of the bank's lending costs.
Interest Rate
The percentage of an amount of money charged by a lender to a borrower for the use of assets.
Effective Interest Rate
A measure of the real cost of borrowing that takes into account the effect of compounding interest in addition to the nominal rate.
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