Answer :

Methoxybenzene reacts with hydroiodic acid HI to form phenol and iodomethane.


Mechanism of the above reaction is as follows:


Methoxybenzene is an alkyl aryl ether. There are two bonds linked with an oxygen atom in methoxybenzene. One is an oxygen-methyl group( O-alkyl bond) and the other one is Oxygen-Aryl group( O-Aryl bond). Out of these, Oxygen-Aryl bond is more stable due to resonance having partial double bond character. So in this reaction, the oxygen-methyl bond gets cleaved to form methyl iodide and phenol.


The reaction of HI with methoxybenzene takes place in two steps.


Step1:


The oxygen of ether gets protonated (addition of proton) by capturing H+ of HI to form protonated ether molecule, known as oxonium ion.


Step 2:


In this step, SN2 reaction occurs since Iodide ion (I-) is a good nucleophile. I- ion preferably attacks the least substituted carbon of protonated ether molecule ( in this case methyl group) to form methyl iodide and phenol.



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