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Alcohols, Phenols And Ethers

Question
CBSEENCH12008094

What is the decreasing order of reactivity of hydrogen halides in the conversion of ROH into RX?

Solution
When alcohols react with a hydrogen halide, a substitution occurs, producing an alkyl halide and water.
R-OH +H-X → R-X + H-OH
The decreasing order of reactivity of hydrogen halide is HI > HBr > HCl