Q79 / 180 · AIIMS 2003 · Chemistry

Assertion : The $\mathrm{O}-\mathrm{O}$ bond length in $\mathrm{H}_2 \mathrm{O}_2$ is shorter than that of $\mathrm{O}_2 \mathrm{~F}_2$. Reason : $\mathrm{H}_2 \mathrm{O}_2$ is an ionic compound.

  • A
    If both assertion and reason are true and the reason is the correct explanation of the assertion
  • B
    If both assertion and reason are true and the reason is not the correct explanation of the assertion
  • C
    If assertion is true but reason is false
  • Correct answer
    D
    If both assertion and reason are false.

Solution

$\mathrm{O}_2 \mathrm{~F}_2$ has the similar structure as that of $\mathrm{H}_2 \mathrm{O}_2$ but the $\mathrm{O}-\mathrm{O}$ bond length is shorter in $\mathrm{O}_2 \mathrm{~F}_2$ than in $\mathrm{H}_2 \mathrm{O}_2$. This is due to the high electronegativity of attached F-atoms.

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

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