Q33 / 160 · TS EAMCET 2008 · Chemistry

The correct order of reactivity of hydrogen halides with ethyl alcohol is

  • A
    $\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}>\mathrm{HI}$
  • B
    $\mathrm{HCl}>\mathrm{HBr}>\mathrm{HF}>\mathrm{HI}$
  • C
    $\mathrm{HBr}>\mathrm{HCl}>\mathrm{HI}>\mathrm{HF}$
  • Correct answer
    D
    $\mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}>\mathrm{HF}$

Solution

Among hydrogen halides, as the size of halide ion increases, its reactivity towards ethyl alcohol also increases. Thus, the order of reactivity of hydrogen halides is $$ \mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}>\mathrm{HF} $$

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

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