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.
$C_{2} H_{5} - O - C_{2} H_{5} + H C l d i e t h y l e t h e r \to ⎡ ⎢ ⎢ ⎣ C_{2} H_{5} - O ∣ H - C_{2} H_{5} ⎤ ⎥ ⎥ ⎦ d i e t h y l o x o n i u m c h l o r i d e C l^{-}$
(iii) When diethyl ether reacts with excess hot concentrated hydroidic acid alkyl iodides are formed.
$C_{2} H_{5} - O - C_{2} H_{5} + 2 H I \to 2 C_{2} H_{5} I + H_{2} O E t h y l i o d i d e$

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