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Question

How are the following reactions effected?
(i) diethyl ether with grignard reagent
(ii) diethyl ether with mineral acid
(iii) ethyl methyl ether with excess hot Conc. HI acid

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Solution

(i) Grignard reagent: An ether solution of Grignard reagent contains the following complex of ether. Thus the Grignard reagent is stabilised in dry ether. Hence ether is used as a solvent for Grignard's reagent.
(ii) With conc. HCl: Stronge mineral acids protonate the ethereal oxygen forming oxonium salt.
C2H5OC2H5+HCldiethylether⎢ ⎢C2H5OHC2H5⎥ ⎥diethyloxoniumchlorideCl
(iii) When diethyl ether reacts with excess hot concentrated hydroidic acid alkyl iodides are formed.
C2H5OC2H5+2HI2C2H5I+H2OEthyliodide

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