What Are the Products of Chlorinating Diphenylether with Cl2 and FeCl3?

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Homework Statement


Show the product(s) of chlorination (Cl2, FeCl3) of diphenylether


Homework Equations


None


The Attempt at a Solution


My solutions manual shows products with Chlorine in the para position, and then the ortho position, with a note saying (followed by disubstitution)

I'm really just looking for some clearing up to this answer. I understand that the oxygen in diphenylether is an ortho/para director, therefore placing Chlorine in the ortho and para position. However, I just assumed this would happen on both phenyl rings. Does it depend on exactly how much Cl2 is provided?
 
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Yes it does matter how much chlorine is present. The question didn't ask about exhaustive chlorination, did it?
 
Nope! It simply put Cl2/FeCl3.

So if given that on a test it's best to assume only monosubstitution? Maybe noting possible disubstitution if more reagent is present?