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HI is a better reagent than HBr for clea...

HI is a better reagent than HBr for cleavage of ether. Explain.

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HI is a stronger acid than HBr and therefore, axonium ion is readily formed. `I^(-)` is also a better nucleophile than `Br^(-)` for nucleophilic substitution reaction.
`R-underset("Ether") underset(* *) overset(* *)O-R+HI to R underset("Oxonium ion") underset(H) underset(|) overset(+) overset(* *)O-R+I^(-),R-overset(* *^(+))underset(H) underset(|)O-R+I^(-)overset("Alcohol") to R-I+R-O-H`
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Knowledge Check

  • The correct order of ease of cleavage of ether linkage by hydrogen halide follows :

    A
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    C
    A is true but R is false
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