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    on addition of bromine to phenol, some of the products have substituted only one, bromine. Some have 2 and some have 3. (occurs with benzene too). Why does this happen?
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    Rate of reaction and stoichiometry.
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    (Original post by TeachChemistry)
    Rate of reaction and stoichiometry.
    Can you please elaborate?
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    (Original post by ______10______)
    Can you please elaborate?
    If the ratio of Br2 : C6H5OH is

    1:1 you'll have monosubstituted phenol (largely)
    2:1 you'll have disubstituted phenol (largely)
    3:1 you'll have trisubstituted phenol (largely)

    Bromine is a deactivating group, on a phenyl ring. This has the consequence of making mono-, di- and tri- bromophenol sequential less reactive towards further bromination. Hence, in a 1:1 mix, it is more likely that all the bromine will react with separate phenol molecules, rather than several bromines adding to one, and leaving some unreacted. The argument continues the same for the other cases.
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    ohh thank you alot
 
 
 
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