1.

When phenyl magensium bromide reacts with tert butanol, which of the following is formed?

Answer»

tert-Butyl methyl ether
Benzene
tert-Butyl benzene
Phenol

Solution :To supress substitution and to facour elimination, the ACID used must have a non-nucleophilic counter ION. The counter ion of `HCl` or `HCl//ZnCl_(2)` or `HBr`, i.e., `Cl'` or `Br'` ion is a strong NUCLEOPHILE and thus FORMS either cylohexyl bromide by substitution reaction. In contrast, the counter ion of `H_(3)PO_(4)` i.e., `PO_(4)^(3-)` is non-nucleophilic and hence does not give substitution , i.e., cyclohexane.


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