For the following reaction-R-OH-HX - R-X -H2OThe reaction will be fastest when HX is-

Reaction with Hydrogen Halide Order of reactivity of HX: HI gt;HBr gt;HCl HF is nbsp;generally unreactive. HI is stronger acid and the reaction becomes f ...

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Byju's Answer

Standard XII

Chemistry

Phthalimide Reaction

For the follo...

Question

For the following reaction:
$R - O H + H X \to R - X + H_{2} O$
The reaction will be fastest when $H X$ is:

H I

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H B r

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H C l

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None of the above

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Solution

The correct option is A $H I$
Reaction with Hydrogen Halide
Order of reactivity of $H X$ :
$H I > H B r > H C l$
$H F$ is generally unreactive.

HI is stronger acid and the reaction becomes faster by protonating alcohol and removing water as a leaving group. In polar protic solvent, $I^{-}$ is better nucleophile than $B r^{-}$ and $C l^{-}$ because $I^{-}$ is less solvated than $B r^{-}$ and $C l^{-}$ due to its larger size.
Hence, (a) is correct.

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For the following reaction: R−OH+HX→R−X+H2O The reaction will be fastest when HX is:

For the following reaction:
$R - O H + H X \to R - X + H_{2} O$
The reaction will be fastest when $H X$ is: