Q15 / 155 · WBJEE 2017 · Chemistry

Of the following compounds, which one is the strongest Bronsted acid in a aqueous solution?

  • Correct answer
    A
    $\mathrm{HClO}_{3}$
  • B
    $\mathrm{HClO}_{2}$
  • C
    $\mathrm{HOCl}$
  • D
    HOBr

Solution

$\because$ Higher be the oxidation number of central atom in oxo-acids, more strongly it behave as Bronsted-acid. Oxidation number for $\mathrm{Cl}$ in $\mathrm{HClO}_{3} \rightarrow+5$ Oxidation number for $\mathrm{Cl}$ in $\mathrm{HClO}_{2} \rightarrow+3$ Oxidation number for $\mathrm{Cl}$ in $\mathrm{HClO} \rightarrow+1$ Oxidation number for $\mathrm{Cl}$ in $\mathrm{HBrO} \rightarrow+1$ Hence, $\mathrm{HClO}_{3}$, is the strongest Bronsted acid in aqueous solution.

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

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