Q20 / 192 · NTA Abhyas (NEET) 2020 · Chemistry · Alcohols Phenols and Ethers

List the hydrogen halide acids in decreasing order of reactivity in the following reaction
R-OH+HX→RX+H2O

  • Correct answer
    A
    HI > HBr > HCl > HF
  • B
    HBr > HI > HCl > HF
  • C
    HI > HCl > HBr > HF
  • D
    HI > HF > HBr > HI

Solution

The relative rate follows same order as of acidity (HI > HBr > HCl > HF) and the nucliophilicity of their conjugate anion, X-(I->Br->Cl->F-) .

Hence, the correct answer is option: 'A'.

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