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Question

Ethers are heated with excess of conc. hydrogen halide to give alkyl halide, then the reactivity order of hydrogen halide is :

A
HCl<HBr<HF
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B
HI>HBr>HCl
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C
HF<HCl<HBr
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D
none of these
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Solution

The correct option is B HI>HBr>HCl
When HX is in excess and reaction is carried out at high temperature. Iodine is a good nucleophile, displaces an alcohol molecule by SN2 mechanism thus HI>HBr>HCl

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