Anisole does not react with HI to form C6 h5 I and CH3OHbecause
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Phenyl methyl ether (anisole)reacts with HI to give phenol and methyl iodide and not iodobenzene and methyl alcohol because the lone pair of O are involved in resonace (+ mesomeric effect) with the benzene ring and imparts it a double bond character and increases the C-O bond strength with the benzene ring. Moreover, the reaction goes via SN 2 mechanism which prefers the attack of nucleophile I− from least hindered side of the molecule. Thus it prefers to attack the methyl group.
Hence Phenyl methyl ether (anisole) reacts with HI to give phenol and methyl iodide and not iodobenzene and methyl alcohol because I− ion prefers to combine with the smaller group in order to minimise steric hindrance.
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